diff --git a/CHANGELOG.md b/CHANGELOG.md
index 648daec50..475fa24a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 
 <section class="release" id="unreleased">
 
-## Unreleased (2024-10-27)
+## Unreleased (2024-10-29)
 
 <section class="packages">
 
@@ -54,6 +54,28 @@
 
 <!-- /.package -->
 
+<section class="package" id="math-base-special-acosdf-unreleased">
+
+#### [@stdlib/math/base/special/acosdf](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/acosdf)
+
+<details>
+
+<section class="features">
+
+##### Features
+
+-   [`b18921a`](https://github.com/stdlib-js/stdlib/commit/b18921a136da2755efccfd6ae23c8b3f5aaa8f4a) - add `math/base/special/acosdf` [(#3015)](https://github.com/stdlib-js/stdlib/pull/3015)
+
+</section>
+
+<!-- /.features -->
+
+</details>
+
+</section>
+
+<!-- /.package -->
+
 <section class="package" id="math-base-special-acotdf-unreleased">
 
 #### [@stdlib/math/base/special/acotdf](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/acotdf)
@@ -502,8 +524,9 @@
 
 ### Contributors
 
-A total of 5 people contributed to this release. Thank you to the following contributors:
+A total of 6 people contributed to this release. Thank you to the following contributors:
 
+-   Aayush Khanna
 -   Aman Bhansali
 -   Athan Reines
 -   Ayaka
@@ -520,6 +543,7 @@ A total of 5 people contributed to this release. Thank you to the following cont
 
 <details>
 
+-   [`b18921a`](https://github.com/stdlib-js/stdlib/commit/b18921a136da2755efccfd6ae23c8b3f5aaa8f4a) - **feat:** add `math/base/special/acosdf` [(#3015)](https://github.com/stdlib-js/stdlib/pull/3015) _(by Aayush Khanna, Athan Reines)_
 -   [`60522bf`](https://github.com/stdlib-js/stdlib/commit/60522bfc0b5574d348301e788400178156731024) - **docs:** fix operator [(#3039)](https://github.com/stdlib-js/stdlib/pull/3039) _(by Gunj Joshi)_
 -   [`84b8294`](https://github.com/stdlib-js/stdlib/commit/84b8294c2d5494ff5eaaa2652dda81671e728068) - **feat:** add `math/base/special/nanmaxf` [(#3035)](https://github.com/stdlib-js/stdlib/pull/3035) _(by Gunj Joshi, Athan Reines)_
 -   [`f770fc2`](https://github.com/stdlib-js/stdlib/commit/f770fc258b7976ebd51fb501290cb33296d2e036) - **docs:** add missing fields in `package.json` [(#3036)](https://github.com/stdlib-js/stdlib/pull/3036) _(by Gunj Joshi)_
diff --git a/base/special/acosdf/README.md b/base/special/acosdf/README.md
new file mode 100644
index 000000000..9f9901ce8
--- /dev/null
+++ b/base/special/acosdf/README.md
@@ -0,0 +1,197 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# acosdf
+
+> Compute the [arccosine][arccosine] (in degrees) of a single-precision floating-point number.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var acosdf = require( '@stdlib/math/base/special/acosdf' );
+```
+
+#### acosdf( x )
+
+Computes the [arccosine][arccosine] (in degrees) of a single-precision floating-point number.
+
+```javascript
+var sqrtf = require( '@stdlib/math/base/special/sqrtf' );
+
+var v = acosdf( 0.0 );
+// returns 90.0
+
+v = acosdf( 0.5 );
+// returns ~60.0
+
+v = acosdf( sqrtf( 2 ) / 2 );
+// returns ~45.0
+
+v = acosdf( sqrtf( 3 ) / 2 );
+// returns ~30.0
+
+v = acosdf( NaN );
+// returns NaN
+```
+
+The domain of `x` is restricted to `[-1,1]`. If `|x| > 1`, the function returns `NaN`.
+
+```javascript
+var v = acosdf( -3.14 );
+// returns NaN
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var linspace = require( '@stdlib/array/base/linspace' );
+var acosdf = require( '@stdlib/math/base/special/acosdf' );
+
+var x = linspace( -1.0, 1.0, 100 );
+
+var i;
+for ( i = 0; i < x.length; i++ ) {
+    console.log( acosdf( x[ i ] ) );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/math/base/special/acosdf.h"
+```
+
+#### stdlib_base_acosdf( x )
+
+Computes the [arccosine][arccosine] (in degrees) of a single-precision floating-point number.
+
+```c
+float out = stdlib_base_acosdf( 0.0f );
+// returns 90.0f
+
+out = stdlib_base_acosdf( 0.5f );
+// returns ~60.0f
+```
+
+The function accepts the following arguments:
+
+-   **x**: `[in] float` input value.
+
+```c
+float stdlib_base_acosdf( const float x );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/math/base/special/acosdf.h"
+#include <stdio.h>
+
+int main( void ) {
+    const float x[] = { 1.0f, 1.45f, 1.89f, 2.33f, 2.78f, 3.22f, 3.66f, 4.11f, 4.55f, 5.0f };
+    
+    float v;
+    int i;
+    for ( i = 0; i < 10; i++ ) {
+        v = stdlib_base_acosdf( x[ i ] );
+        printf( "acosdf(%f) = %f\n", x[ i ], v );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[arccosine]: https://en.wikipedia.org/wiki/Inverse_trigonometric_functions
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->
diff --git a/base/special/acosdf/benchmark/benchmark.js b/base/special/acosdf/benchmark/benchmark.js
new file mode 100644
index 000000000..188873866
--- /dev/null
+++ b/base/special/acosdf/benchmark/benchmark.js
@@ -0,0 +1,52 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var randu = require( '@stdlib/random/array/uniform' );
+var isnanf = require( './../../../../base/assert/is-nanf' );
+var pkg = require( './../package.json' ).name;
+var acosdf = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = randu( 100, -1.0, 1.0 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = acosdf( x[ i % x.length ] );
+		if ( isnanf( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnanf( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
diff --git a/base/special/acosdf/benchmark/benchmark.native.js b/base/special/acosdf/benchmark/benchmark.native.js
new file mode 100644
index 000000000..26a03471b
--- /dev/null
+++ b/base/special/acosdf/benchmark/benchmark.native.js
@@ -0,0 +1,61 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var resolve = require( 'path' ).resolve;
+var bench = require( '@stdlib/bench' );
+var randu = require( '@stdlib/random/array/uniform' );
+var isnanf = require( './../../../../base/assert/is-nanf' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var acosdf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( acosdf instanceof Error )
+};
+
+
+// MAIN //
+
+bench( pkg+'::native', opts, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = randu( 100, -1.0, 1.0 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = acosdf( x[ i % x.length ] );
+		if ( isnanf( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnanf( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
diff --git a/base/special/acosdf/benchmark/c/native/Makefile b/base/special/acosdf/benchmark/c/native/Makefile
new file mode 100644
index 000000000..f69e9da2b
--- /dev/null
+++ b/base/special/acosdf/benchmark/c/native/Makefile
@@ -0,0 +1,146 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# VARIABLES #
+
+ifndef VERBOSE
+	QUIET := @
+else
+	QUIET :=
+endif
+
+# Determine the OS ([1][1], [2][2]).
+#
+# [1]: https://en.wikipedia.org/wiki/Uname#Examples
+# [2]: http://stackoverflow.com/a/27776822/2225624
+OS ?= $(shell uname)
+ifneq (, $(findstring MINGW,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring MSYS,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring CYGWIN,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring Windows_NT,$(OS)))
+	OS := WINNT
+endif
+endif
+endif
+endif
+
+# Define the program used for compiling C source files:
+ifdef C_COMPILER
+	CC := $(C_COMPILER)
+else
+	CC := gcc
+endif
+
+# Define the command-line options when compiling C files:
+CFLAGS ?= \
+	-std=c99 \
+	-O3 \
+	-Wall \
+	-pedantic
+
+# Determine whether to generate position independent code ([1][1], [2][2]).
+#
+# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
+# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
+ifeq ($(OS), WINNT)
+	fPIC ?=
+else
+	fPIC ?= -fPIC
+endif
+
+# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`):
+INCLUDE ?=
+
+# List of source files:
+SOURCE_FILES ?=
+
+# List of libraries (e.g., `-lopenblas -lpthread`):
+LIBRARIES ?=
+
+# List of library paths (e.g., `-L /foo/bar -L /beep/boop`):
+LIBPATH ?=
+
+# List of C targets:
+c_targets := benchmark.out
+
+
+# RULES #
+
+#/
+# Compiles source files.
+#
+# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`)
+# @param {string} [CFLAGS] - C compiler options
+# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`)
+# @param {string} [SOURCE_FILES] - list of source files
+# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`)
+# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`)
+#
+# @example
+# make
+#
+# @example
+# make all
+#/
+all: $(c_targets)
+
+.PHONY: all
+
+#/
+# Compiles C source files.
+#
+# @private
+# @param {string} CC - C compiler (e.g., `gcc`)
+# @param {string} CFLAGS - C compiler options
+# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`)
+# @param {string} SOURCE_FILES - list of source files
+# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`)
+# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`)
+#/
+$(c_targets): %.out: %.c
+	$(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES)
+
+#/
+# Runs compiled benchmarks.
+#
+# @example
+# make run
+#/
+run: $(c_targets)
+	$(QUIET) ./$<
+
+.PHONY: run
+
+#/
+# Removes generated files.
+#
+# @example
+# make clean
+#/
+clean:
+	$(QUIET) -rm -f *.o *.out
+
+.PHONY: clean
diff --git a/base/special/acosdf/benchmark/c/native/benchmark.c b/base/special/acosdf/benchmark/c/native/benchmark.c
new file mode 100644
index 000000000..84752b218
--- /dev/null
+++ b/base/special/acosdf/benchmark/c/native/benchmark.c
@@ -0,0 +1,136 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/math/base/special/acosdf.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <time.h>
+#include <sys/time.h>
+
+#define NAME "acosdf"
+#define ITERATIONS 1000000
+#define REPEATS 3
+
+/**
+* Prints the TAP version.
+*/
+static void print_version( void ) {
+	printf( "TAP version 13\n" );
+}
+
+/**
+* Prints the TAP summary.
+*
+* @param total     total number of tests
+* @param passing   total number of passing tests
+*/
+static void print_summary( int total, int passing ) {
+	printf( "#\n" );
+	printf( "1..%d\n", total ); // TAP plan
+	printf( "# total %d\n", total );
+	printf( "# pass  %d\n", passing );
+	printf( "#\n" );
+	printf( "# ok\n" );
+}
+
+/**
+* Prints benchmarks results.
+*
+* @param elapsed   elapsed time in seconds
+*/
+static void print_results( double elapsed ) {
+	double rate = (double)ITERATIONS / elapsed;
+	printf( "  ---\n" );
+	printf( "  iterations: %d\n", ITERATIONS );
+	printf( "  elapsed: %0.9f\n", elapsed );
+	printf( "  rate: %0.9f\n", rate );
+	printf( "  ...\n" );
+}
+
+/**
+* Returns a clock time.
+*
+* @return clock time
+*/
+static double tic( void ) {
+	struct timeval now;
+	gettimeofday( &now, NULL );
+	return (double)now.tv_sec + (double)now.tv_usec/1.0e6;
+}
+
+/**
+* Generates a random number on the interval [0,1).
+*
+* @return random number
+*/
+static float rand_float( void ) {
+	int r = rand();
+	return (float)r / ( (float)RAND_MAX + 1.0f );
+}
+
+/**
+* Runs a benchmark.
+*
+* @return elapsed time in seconds
+*/
+static double benchmark( void ) {
+	double elapsed;
+	float x[ 100 ];
+	double t;
+	float y;
+	int i;
+
+	for ( i = 0; i < 100; i++ ) {
+		x[ i ] = ( 2.0f * rand_float() ) - 1.0f;
+	}
+
+	t = tic();
+	for ( i = 0; i < ITERATIONS; i++ ) {
+		y = stdlib_base_acosdf( x[ i % 100 ] );
+		if ( y != y ) {
+			printf( "should not return NaN\n" );
+			break;
+		}
+	}
+	elapsed = tic() - t;
+	if ( y != y ) {
+		printf( "should not return NaN\n" );
+	}
+	return elapsed;
+}
+
+/**
+* Main execution sequence.
+*/
+int main( void ) {
+	double elapsed;
+	int i;
+
+	// Use the current time to seed the random number generator:
+	srand( time( NULL ) );
+
+	print_version();
+	for ( i = 0; i < REPEATS; i++ ) {
+		printf( "# c::native::%s\n", NAME );
+		elapsed = benchmark();
+		print_results( elapsed );
+		printf( "ok %d benchmark finished\n", i+1 );
+	}
+	print_summary( REPEATS, REPEATS );
+}
diff --git a/base/special/acosdf/binding.gyp b/base/special/acosdf/binding.gyp
new file mode 100644
index 000000000..ec3992233
--- /dev/null
+++ b/base/special/acosdf/binding.gyp
@@ -0,0 +1,170 @@
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A `.gyp` file for building a Node.js native add-on.
+#
+# [1]: https://gyp.gsrc.io/docs/InputFormatReference.md
+# [2]: https://gyp.gsrc.io/docs/UserDocumentation.md
+{
+  # List of files to include in this file:
+  'includes': [
+    './include.gypi',
+  ],
+
+  # Define variables to be used throughout the configuration for all targets:
+  'variables': {
+    # Target name should match the add-on export name:
+    'addon_target_name%': 'addon',
+
+    # Set variables based on the host OS:
+    'conditions': [
+      [
+        'OS=="win"',
+        {
+          # Define the object file suffix:
+          'obj': 'obj',
+        },
+        {
+          # Define the object file suffix:
+          'obj': 'o',
+        }
+      ], # end condition (OS=="win")
+    ], # end conditions
+  }, # end variables
+
+  # Define compile targets:
+  'targets': [
+
+    # Target to generate an add-on:
+    {
+      # The target name should match the add-on export name:
+      'target_name': '<(addon_target_name)',
+
+      # Define dependencies:
+      'dependencies': [],
+
+      # Define directories which contain relevant include headers:
+      'include_dirs': [
+        # Local include directory:
+        '<@(include_dirs)',
+      ],
+
+      # List of source files:
+      'sources': [
+        '<@(src_files)',
+      ],
+
+      # Settings which should be applied when a target's object files are used as linker input:
+      'link_settings': {
+        # Define libraries:
+        'libraries': [
+          '<@(libraries)',
+        ],
+
+        # Define library directories:
+        'library_dirs': [
+          '<@(library_dirs)',
+        ],
+      },
+
+      # C/C++ compiler flags:
+      'cflags': [
+        # Enable commonly used warning options:
+        '-Wall',
+
+        # Aggressive optimization:
+        '-O3',
+      ],
+
+      # C specific compiler flags:
+      'cflags_c': [
+        # Specify the C standard to which a program is expected to conform:
+        '-std=c99',
+      ],
+
+      # C++ specific compiler flags:
+      'cflags_cpp': [
+        # Specify the C++ standard to which a program is expected to conform:
+        '-std=c++11',
+      ],
+
+      # Linker flags:
+      'ldflags': [],
+
+      # Apply conditions based on the host OS:
+      'conditions': [
+        [
+          'OS=="mac"',
+          {
+            # Linker flags:
+            'ldflags': [
+              '-undefined dynamic_lookup',
+              '-Wl,-no-pie',
+              '-Wl,-search_paths_first',
+            ],
+          },
+        ], # end condition (OS=="mac")
+        [
+          'OS!="win"',
+          {
+            # C/C++ flags:
+            'cflags': [
+              # Generate platform-independent code:
+              '-fPIC',
+            ],
+          },
+        ], # end condition (OS!="win")
+      ], # end conditions
+    }, # end target <(addon_target_name)
+
+    # Target to copy a generated add-on to a standard location:
+    {
+      'target_name': 'copy_addon',
+
+      # Declare that the output of this target is not linked:
+      'type': 'none',
+
+      # Define dependencies:
+      'dependencies': [
+        # Require that the add-on be generated before building this target:
+        '<(addon_target_name)',
+      ],
+
+      # Define a list of actions:
+      'actions': [
+        {
+          'action_name': 'copy_addon',
+          'message': 'Copying addon...',
+
+          # Explicitly list the inputs in the command-line invocation below:
+          'inputs': [],
+
+          # Declare the expected outputs:
+          'outputs': [
+            '<(addon_output_dir)/<(addon_target_name).node',
+          ],
+
+          # Define the command-line invocation:
+          'action': [
+            'cp',
+            '<(PRODUCT_DIR)/<(addon_target_name).node',
+            '<(addon_output_dir)/<(addon_target_name).node',
+          ],
+        },
+      ], # end actions
+    }, # end target copy_addon
+  ], # end targets
+}
diff --git a/base/special/acosdf/docs/repl.txt b/base/special/acosdf/docs/repl.txt
new file mode 100644
index 000000000..92b4a3b8d
--- /dev/null
+++ b/base/special/acosdf/docs/repl.txt
@@ -0,0 +1,29 @@
+
+{{alias}}( x )
+    Computes the arccosine (in degrees) of a single-precision floating-point
+    number.
+
+    If `|x| > 1`, the function returns `NaN`.
+
+    Parameters
+    ----------
+    x: number
+        Input value.
+
+    Returns
+    -------
+    y: number
+        Arccosine (in degrees).
+
+    Examples
+    --------
+    > var y = {{alias}}( 0.0 )
+    90.0
+    > y = {{alias}}( {{alias:@stdlib/constants/float32/pi}} / 6.0 )
+    ~58.43
+    > y = {{alias}}( NaN )
+    NaN
+
+    See Also
+    --------
+
diff --git a/base/special/acosdf/docs/types/index.d.ts b/base/special/acosdf/docs/types/index.d.ts
new file mode 100644
index 000000000..1db235c1e
--- /dev/null
+++ b/base/special/acosdf/docs/types/index.d.ts
@@ -0,0 +1,56 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+/**
+* Computes the arccosine (in degrees) of a single-precision floating-point number.
+*
+* @param x - input value
+* @returns arccosine (in degrees)
+*
+* @example
+* var v = acosdf( 0.0 );
+* // returns 0.0
+*
+* @example
+* var v = acosdf( 0.5 );
+* // returns ~60.0
+*
+* @example
+* var sqrtf = require( '@stdlib/math/base/special/sqrtf' );
+*
+* var v = acosdf( sqrtf( 2 ) / 2 );
+* // returns ~45.0
+*
+* @example
+* var sqrtf = require( '@stdlib/math/base/special/sqrtf' );
+*
+* var v = acosdf( sqrtf( 3 ) / 2 );
+* // returns ~30.0
+*
+* @example
+* var v = acosdf( NaN );
+* // returns NaN
+*/
+declare function acosdf( x: number ): number;
+
+
+// EXPORTS //
+
+export = acosdf;
diff --git a/base/special/acosdf/docs/types/test.ts b/base/special/acosdf/docs/types/test.ts
new file mode 100644
index 000000000..53a795e67
--- /dev/null
+++ b/base/special/acosdf/docs/types/test.ts
@@ -0,0 +1,44 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import acosdf = require( './index' );
+
+
+// TESTS //
+
+// The function returns a number...
+{
+	acosdf( 0.5 ); // $ExpectType number
+}
+
+// The compiler throws an error if the function is provided a value other than a number...
+{
+	acosdf( true ); // $ExpectError
+	acosdf( false ); // $ExpectError
+	acosdf( null ); // $ExpectError
+	acosdf( undefined ); // $ExpectError
+	acosdf( '5' ); // $ExpectError
+	acosdf( [] ); // $ExpectError
+	acosdf( {} ); // $ExpectError
+	acosdf( ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided insufficient arguments...
+{
+	acosdf(); // $ExpectError
+}
diff --git a/base/special/acosdf/examples/c/Makefile b/base/special/acosdf/examples/c/Makefile
new file mode 100644
index 000000000..6aed70daf
--- /dev/null
+++ b/base/special/acosdf/examples/c/Makefile
@@ -0,0 +1,146 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# VARIABLES #
+
+ifndef VERBOSE
+	QUIET := @
+else
+	QUIET :=
+endif
+
+# Determine the OS ([1][1], [2][2]).
+#
+# [1]: https://en.wikipedia.org/wiki/Uname#Examples
+# [2]: http://stackoverflow.com/a/27776822/2225624
+OS ?= $(shell uname)
+ifneq (, $(findstring MINGW,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring MSYS,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring CYGWIN,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring Windows_NT,$(OS)))
+	OS := WINNT
+endif
+endif
+endif
+endif
+
+# Define the program used for compiling C source files:
+ifdef C_COMPILER
+	CC := $(C_COMPILER)
+else
+	CC := gcc
+endif
+
+# Define the command-line options when compiling C files:
+CFLAGS ?= \
+	-std=c99 \
+	-O3 \
+	-Wall \
+	-pedantic
+
+# Determine whether to generate position independent code ([1][1], [2][2]).
+#
+# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
+# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
+ifeq ($(OS), WINNT)
+	fPIC ?=
+else
+	fPIC ?= -fPIC
+endif
+
+# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`):
+INCLUDE ?=
+
+# List of source files:
+SOURCE_FILES ?=
+
+# List of libraries (e.g., `-lopenblas -lpthread`):
+LIBRARIES ?=
+
+# List of library paths (e.g., `-L /foo/bar -L /beep/boop`):
+LIBPATH ?=
+
+# List of C targets:
+c_targets := example.out
+
+
+# RULES #
+
+#/
+# Compiles source files.
+#
+# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`)
+# @param {string} [CFLAGS] - C compiler options
+# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`)
+# @param {string} [SOURCE_FILES] - list of source files
+# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`)
+# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`)
+#
+# @example
+# make
+#
+# @example
+# make all
+#/
+all: $(c_targets)
+
+.PHONY: all
+
+#/
+# Compiles C source files.
+#
+# @private
+# @param {string} CC - C compiler (e.g., `gcc`)
+# @param {string} CFLAGS - C compiler options
+# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`)
+# @param {string} SOURCE_FILES - list of source files
+# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`)
+# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`)
+#/
+$(c_targets): %.out: %.c
+	$(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES)
+
+#/
+# Runs compiled examples.
+#
+# @example
+# make run
+#/
+run: $(c_targets)
+	$(QUIET) ./$<
+
+.PHONY: run
+
+#/
+# Removes generated files.
+#
+# @example
+# make clean
+#/
+clean:
+	$(QUIET) -rm -f *.o *.out
+
+.PHONY: clean
diff --git a/base/special/acosdf/examples/c/example.c b/base/special/acosdf/examples/c/example.c
new file mode 100644
index 000000000..3fa83fb7d
--- /dev/null
+++ b/base/special/acosdf/examples/c/example.c
@@ -0,0 +1,31 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/math/base/special/acosdf.h"
+#include <stdio.h>
+
+int main( void ) {
+	const float x[] = { 1.0f, 1.45f, 1.89f, 2.33f, 2.78f, 3.22f, 3.66f, 4.11f, 4.55f, 5.0f };
+
+	float v;
+	int i;
+	for ( i = 0; i < 10; i++ ) {
+		v = stdlib_base_acosdf( x[ i ] );
+		printf( "acosdf(%f) = %f\n", x[ i ], v );
+	}
+}
diff --git a/base/special/acosdf/examples/index.js b/base/special/acosdf/examples/index.js
new file mode 100644
index 000000000..a32a8afd7
--- /dev/null
+++ b/base/special/acosdf/examples/index.js
@@ -0,0 +1,29 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var linspace = require( '@stdlib/array/base/linspace' );
+var acosdf = require( './../lib' );
+
+var x = linspace( -1.0, 1.0, 100 );
+
+var i;
+for ( i = 0; i < x.length; i++ ) {
+	console.log( 'acosdf(%d) = %d', x[ i ], acosdf( x[ i ] ) );
+}
diff --git a/base/special/acosdf/include.gypi b/base/special/acosdf/include.gypi
new file mode 100644
index 000000000..575cb043c
--- /dev/null
+++ b/base/special/acosdf/include.gypi
@@ -0,0 +1,53 @@
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A GYP include file for building a Node.js native add-on.
+#
+# Main documentation:
+#
+# [1]: https://gyp.gsrc.io/docs/InputFormatReference.md
+# [2]: https://gyp.gsrc.io/docs/UserDocumentation.md
+{
+  # Define variables to be used throughout the configuration for all targets:
+  'variables': {
+    # Source directory:
+    'src_dir': './src',
+
+    # Include directories:
+    'include_dirs': [
+      '<!@(node -e "var arr = require(\'@stdlib/utils/library-manifest\')(\'./manifest.json\',{},{\'basedir\':process.cwd(),\'paths\':\'posix\'}).include; for ( var i = 0; i < arr.length; i++ ) { console.log( arr[ i ] ); }")',
+    ],
+
+    # Add-on destination directory:
+    'addon_output_dir': './src',
+
+    # Source files:
+    'src_files': [
+      '<(src_dir)/addon.c',
+      '<!@(node -e "var arr = require(\'@stdlib/utils/library-manifest\')(\'./manifest.json\',{},{\'basedir\':process.cwd(),\'paths\':\'posix\'}).src; for ( var i = 0; i < arr.length; i++ ) { console.log( arr[ i ] ); }")',
+    ],
+
+    # Library dependencies:
+    'libraries': [
+      '<!@(node -e "var arr = require(\'@stdlib/utils/library-manifest\')(\'./manifest.json\',{},{\'basedir\':process.cwd(),\'paths\':\'posix\'}).libraries; for ( var i = 0; i < arr.length; i++ ) { console.log( arr[ i ] ); }")',
+    ],
+
+    # Library directories:
+    'library_dirs': [
+      '<!@(node -e "var arr = require(\'@stdlib/utils/library-manifest\')(\'./manifest.json\',{},{\'basedir\':process.cwd(),\'paths\':\'posix\'}).libpath; for ( var i = 0; i < arr.length; i++ ) { console.log( arr[ i ] ); }")',
+    ],
+  }, # end variables
+}
diff --git a/base/special/acosdf/include/stdlib/math/base/special/acosdf.h b/base/special/acosdf/include/stdlib/math/base/special/acosdf.h
new file mode 100644
index 000000000..2c02d089f
--- /dev/null
+++ b/base/special/acosdf/include/stdlib/math/base/special/acosdf.h
@@ -0,0 +1,38 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#ifndef STDLIB_MATH_BASE_SPECIAL_ACOSDF_H
+#define STDLIB_MATH_BASE_SPECIAL_ACOSDF_H
+
+/*
+* If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.
+*/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+* Computes the arccosine (in degrees) of a single-precision floating-point number.
+*/
+float stdlib_base_acosdf( const float x );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !STDLIB_MATH_BASE_SPECIAL_ACOSDF_H
diff --git a/base/special/acosdf/lib/index.js b/base/special/acosdf/lib/index.js
new file mode 100644
index 000000000..54cf2cb74
--- /dev/null
+++ b/base/special/acosdf/lib/index.js
@@ -0,0 +1,53 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Compute the arccosine (in degrees) of a single-precision floating-point number.
+*
+* @module @stdlib/math/base/special/acosdf
+*
+* @example
+* var sqrtf = require( '@stdlib/math/base/special/sqrtf' );
+* var acosdf = require( '@stdlib/math/base/special/acosdf' );
+*
+* var v = acosdf( 0.0 );
+* // returns 90.0
+*
+* var v = acosdf( 0.5 );
+* // returns ~60.0
+*
+* var v = acosdf( sqrtf( 2 ) / 2 );
+* // returns ~45.0
+*
+* var v = acosdf( sqrtf( 3 ) / 2 );
+* // returns ~30.0
+*
+* var v = acosdf( NaN );
+* // returns NaN
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/base/special/acosdf/lib/main.js b/base/special/acosdf/lib/main.js
new file mode 100644
index 000000000..6899954b6
--- /dev/null
+++ b/base/special/acosdf/lib/main.js
@@ -0,0 +1,66 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var rad2degf = require( './../../../../base/special/rad2degf' );
+var acosf = require( './../../../../base/special/acosf' );
+
+
+// MAIN //
+
+/**
+* Computes the arccosine (in degrees) of a single-precision floating-point number.
+*
+* @param {number} x - input value
+* @returns {number} arccosine (in degrees)
+*
+* @example
+* var v = acosdf( 0.0 );
+* // returns 90.0
+*
+* @example
+* var v = acosdf( 0.5 );
+* // returns ~60.0
+*
+* @example
+* var sqrtf = require( '@stdlib/math/base/special/sqrtf' );
+*
+* var v = acosdf( sqrtf( 2 ) / 2 );
+* // returns ~45.0
+*
+* @example
+* var sqrtf = require( '@stdlib/math/base/special/sqrtf' );
+*
+* var v = acosdf( sqrtf( 3 ) / 2 );
+* // returns ~30.0
+*
+* @example
+* var v = acosdf( NaN );
+* // returns NaN
+*/
+function acosdf( x ) {
+	return rad2degf( acosf( x ) );
+}
+
+
+// EXPORTS //
+
+module.exports = acosdf;
diff --git a/base/special/acosdf/lib/native.js b/base/special/acosdf/lib/native.js
new file mode 100644
index 000000000..3e89072d8
--- /dev/null
+++ b/base/special/acosdf/lib/native.js
@@ -0,0 +1,65 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var addon = require( './../src/addon.node' );
+
+
+// MAIN //
+
+/**
+* Computes the arccosine (in degrees) of a single-precision floating-point number.
+*
+* @param {number} x - input value
+* @returns {number} arccosine (in degrees)
+*
+* @example
+* var v = acosdf( 0.0 );
+* // returns 90.0
+*
+* @example
+* var v = acosdf( 0.5 );
+* // returns ~60.0
+*
+* @example
+* var sqrtf = require( '@stdlib/math/base/special/sqrtf' );
+*
+* var v = acosdf( sqrtf( 2 ) / 2 );
+* // returns ~45.0
+*
+* @example
+* var sqrtf = require( '@stdlib/math/base/special/sqrtf' );
+*
+* var v = acosdf( sqrtf( 3 ) / 2 );
+* // returns ~30.0
+*
+* @example
+* var v = acosdf( NaN );
+* // returns NaN
+*/
+function acosdf( x ) {
+	return addon( x );
+}
+
+
+// EXPORTS //
+
+module.exports = acosdf;
diff --git a/base/special/acosdf/manifest.json b/base/special/acosdf/manifest.json
new file mode 100644
index 000000000..4a85a6bf0
--- /dev/null
+++ b/base/special/acosdf/manifest.json
@@ -0,0 +1,75 @@
+{
+  "options": {
+    "task": "build"
+  },
+  "fields": [
+    {
+      "field": "src",
+      "resolve": true,
+      "relative": true
+    },
+    {
+      "field": "include",
+      "resolve": true,
+      "relative": true
+    },
+    {
+      "field": "libraries",
+      "resolve": false,
+      "relative": false
+    },
+    {
+      "field": "libpath",
+      "resolve": true,
+      "relative": false
+    }
+  ],
+  "confs": [
+    {
+      "task": "build",
+      "src": [
+        "./src/main.c"
+      ],
+      "include": [
+        "./include"
+      ],
+      "libraries": [],
+      "libpath": [],
+      "dependencies": [
+        "@stdlib/math/base/napi/unary",
+        "@stdlib/math/base/special/rad2degf",
+        "@stdlib/math/base/special/acosf"
+      ]
+    },
+    {
+      "task": "benchmark",
+      "src": [
+        "./src/main.c"
+      ],
+      "include": [
+        "./include"
+      ],
+      "libraries": [],
+      "libpath": [],
+      "dependencies": [
+        "@stdlib/math/base/special/rad2degf",
+        "@stdlib/math/base/special/acosf"
+      ]
+    },
+    {
+      "task": "examples",
+      "src": [
+        "./src/main.c"
+      ],
+      "include": [
+        "./include"
+      ],
+      "libraries": [],
+      "libpath": [],
+      "dependencies": [
+        "@stdlib/math/base/special/rad2degf",
+        "@stdlib/math/base/special/acosf"
+      ]
+    }
+  ]
+}
diff --git a/base/special/acosdf/package.json b/base/special/acosdf/package.json
new file mode 100644
index 000000000..4deea7f0f
--- /dev/null
+++ b/base/special/acosdf/package.json
@@ -0,0 +1,67 @@
+{
+  "name": "@stdlib/math/base/special/acosdf",
+  "version": "0.0.0",
+  "description": "Compute the arccosine (in degrees) of a single-precision floating-point number.",
+  "license": "Apache-2.0",
+  "author": {
+    "name": "The Stdlib Authors",
+    "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+  },
+  "contributors": [
+    {
+      "name": "The Stdlib Authors",
+      "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+    }
+  ],
+  "main": "./lib",
+  "gypfile": true,
+  "directories": {
+    "benchmark": "./benchmark",
+    "doc": "./docs",
+    "example": "./examples",
+    "include": "./include",
+    "lib": "./lib",
+    "src": "./src",
+    "test": "./test"
+  },
+  "types": "./docs/types",
+  "scripts": {},
+  "homepage": "https://github.com/stdlib-js/stdlib",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/stdlib-js/stdlib.git"
+  },
+  "bugs": {
+    "url": "https://github.com/stdlib-js/stdlib/issues"
+  },
+  "dependencies": {},
+  "devDependencies": {},
+  "engines": {
+    "node": ">=0.10.0",
+    "npm": ">2.7.0"
+  },
+  "os": [
+    "aix",
+    "darwin",
+    "freebsd",
+    "linux",
+    "macos",
+    "openbsd",
+    "sunos",
+    "win32",
+    "windows"
+  ],
+  "keywords": [
+    "stdlib",
+    "stdmath",
+    "mathematics",
+    "math",
+    "degree",
+    "arccosine",
+    "cosine",
+    "inverse",
+    "trig",
+    "trigonometry",
+    "radians"
+  ]
+}
diff --git a/base/special/acosdf/src/Makefile b/base/special/acosdf/src/Makefile
new file mode 100644
index 000000000..f30ea003e
--- /dev/null
+++ b/base/special/acosdf/src/Makefile
@@ -0,0 +1,71 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# VARIABLES #
+
+ifndef VERBOSE
+	QUIET := @
+else
+	QUIET :=
+endif
+
+# Determine the OS ([1][1], [2][2]).
+#
+# [1]: https://en.wikipedia.org/wiki/Uname#Examples
+# [2]: http://stackoverflow.com/a/27776822/2225624
+OS ?= $(shell uname)
+ifneq (, $(findstring MINGW,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring MSYS,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring CYGWIN,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring Windows_NT,$(OS)))
+	OS := WINNT
+endif
+endif
+endif
+endif
+
+
+# RULES #
+
+#/
+# Removes generated files for building an add-on.
+#
+# @example
+# make clean-addon
+#/
+clean-addon:
+	$(QUIET) -rm -f *.o *.node
+
+.PHONY: clean-addon
+
+#/
+# Removes generated files.
+#
+# @example
+# make clean
+#/
+clean: clean-addon
+
+.PHONY: clean
+
diff --git a/base/special/acosdf/src/addon.c b/base/special/acosdf/src/addon.c
new file mode 100644
index 000000000..80c65cb8d
--- /dev/null
+++ b/base/special/acosdf/src/addon.c
@@ -0,0 +1,23 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/math/base/special/acosdf.h"
+#include "stdlib/math/base/napi/unary.h"
+
+// cppcheck-suppress shadowFunction
+STDLIB_MATH_BASE_NAPI_MODULE_F_F( stdlib_base_acosdf )
diff --git a/base/special/acosdf/src/main.c b/base/special/acosdf/src/main.c
new file mode 100644
index 000000000..6246d309f
--- /dev/null
+++ b/base/special/acosdf/src/main.c
@@ -0,0 +1,36 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/math/base/special/acosdf.h"
+#include "stdlib/math/base/special/acosf.h"
+#include "stdlib/math/base/special/rad2degf.h"
+
+/**
+* Computes the arccosine (in degrees) of a single-precision floating-point number.
+*
+* @param x    input value
+* @return     arccosine (in degrees)
+*
+* @example
+* float v = stdlib_base_acosdf( 0.0f );
+* // returns 90.0f
+*/
+float stdlib_base_acosdf( const float x ) {
+	float rad = stdlib_base_acosf( x );
+	return stdlib_base_rad2degf( rad );
+}
diff --git a/base/special/acosdf/test/fixtures/julia/REQUIRE b/base/special/acosdf/test/fixtures/julia/REQUIRE
new file mode 100644
index 000000000..ae40bf736
--- /dev/null
+++ b/base/special/acosdf/test/fixtures/julia/REQUIRE
@@ -0,0 +1,2 @@
+julia 1.5
+JSON 0.21
\ No newline at end of file
diff --git a/base/special/acosdf/test/fixtures/julia/negative.json b/base/special/acosdf/test/fixtures/julia/negative.json
new file mode 100644
index 000000000..4c10f33c6
--- /dev/null
+++ b/base/special/acosdf/test/fixtures/julia/negative.json
@@ -0,0 +1 @@
+{"expected":[180.0,178.189,177.43874,176.86293,176.3775,175.94977,175.563,175.20726,174.87614,174.56512,174.2709,173.99098,173.72354,173.467,173.22011,172.98186,172.75136,172.52797,172.31104,172.1,171.89442,171.69391,171.49811,171.30667,171.11932,170.9358,170.75592,170.57944,170.40616,170.23593,170.0686,169.904,169.74205,169.58255,169.42545,169.27061,169.11797,168.9674,168.81883,168.6722,168.5274,168.3844,168.2431,168.10345,167.96542,167.82893,167.69392,167.56035,167.42819,167.29738,167.16788,167.03963,166.91263,166.78685,166.66222,166.5387,166.41632,166.29498,166.17473,166.05547,165.93718,165.81989,165.70352,165.58809,165.47354,165.35988,165.24707,165.1351,165.02396,164.91359,164.80403,164.69522,164.58717,164.47986,164.37325,164.26735,164.16216,164.05762,163.95375,163.85054,163.74797,163.64603,163.54468,163.44394,163.3438,163.24425,163.14525,163.04683,162.94896,162.85164,162.75484,162.65854,162.56279,162.46754,162.37279,162.2785,162.18474,162.09143,161.9986,161.9062,161.81429,161.72281,161.63177,161.54118,161.45099,161.36124,161.2719,161.18297,161.09442,161.0063,160.91856,160.83122,160.74425,160.65765,160.57143,160.48557,160.40009,160.31494,160.23015,160.14572,160.06161,159.97786,159.89444,159.81136,159.72858,159.64615,159.56401,159.48221,159.40071,159.31952,159.23863,159.15804,159.07774,158.99776,158.91805,158.83862,158.75949,158.68063,158.60205,158.52374,158.44571,158.36794,158.29045,158.2132,158.13622,158.05951,157.98303,157.90681,157.83084,157.75513,157.67964,157.60442,157.52942,157.45465,157.38013,157.30583,157.23177,157.15793,157.08432,157.01093,156.93777,156.8648,156.79208,156.71956,156.64726,156.57515,156.50327,156.4316,156.36012,156.28886,156.21779,156.14691,156.07623,156.00577,155.93547,155.86539,155.79549,155.72578,155.65627,155.58691,155.51778,155.4488,155.38002,155.3114,155.24298,155.17473,155.10664,155.03874,154.97101,154.90344,154.83606,154.76883,154.70178,154.63489,154.56818,154.5016,154.4352,154.36896,154.30289,154.23695,154.17119,154.10559,154.04013,153.97484,153.90967,153.84468,153.77982,153.71512,153.65057,153.58615,153.5219,153.45778,153.39381,153.32997,153.26628,153.20273,153.13933,153.07605,153.01291,152.94992,152.88705,152.82433,152.76172,152.69925,152.63693,152.57472,152.51266,152.45071,152.3889,152.32721,152.26566,152.20421,152.14291,152.08173,152.02066,151.95972,151.8989,151.8382,151.77763,151.71716,151.65681,151.59659,151.5365,151.4765,151.41663,151.35686,151.29721,151.23767,151.17827,151.11894,151.05975,151.00067,150.94168,150.8828,150.82405,150.76541,150.70686,150.6484,150.59007,150.53185,150.47372,150.4157,150.35779,150.29997,150.24226,150.18465,150.12714,150.06973,150.01242,149.95522,149.89812,149.8411,149.78416,149.72736,149.67064,149.614,149.55746,149.50104,149.4447,149.38844,149.33229,149.27621,149.22026,149.16437,149.10857,149.05287,148.99728,148.94176,148.88632,148.831,148.77573,148.72057,148.66548,148.61049,148.5556,148.50078,148.44606,148.3914,148.33684,148.28236,148.22797,148.17365,148.11942,148.06528,148.01122,147.95723,147.90332,147.8495,147.79576,147.74211,147.68852,147.63503,147.5816,147.52826,147.47498,147.42178,147.36867,147.31564,147.2627,147.20981,147.157,147.10426,147.05162,146.99902,146.94652,146.89409,146.8417,146.78943,146.73721,146.68507,146.63301,146.58101,146.52907,146.4772,146.42543,146.3737,146.32207,146.2705,146.219,146.16754,146.11618,146.06487,146.01364,145.9625,145.91138,145.86037,145.8094,145.7585,145.70769,145.65692,145.60622,145.55559,145.50502,145.45451,145.40408,145.3537,145.30339,145.25314,145.20296,145.15285,145.1028,145.0528,145.00287,144.953,144.9032,144.85344,144.80377,144.75414,144.70457,144.65506,144.60562,144.55624,144.50693,144.45766,144.40846,144.35931,144.31023,144.26122,144.21223,144.16331,144.11447,144.06567,144.01694,143.96825,143.91963,143.87106,143.82254,143.7741,143.7257,143.67735,143.62906,143.58084,143.53265,143.48454,143.43645,143.38844,143.34048,143.29259,143.24472,143.19693,143.14917,143.10149,143.05383,143.00626,142.95872,142.91124,142.86382,142.81642,142.7691,142.72182,142.67459,142.62743,142.5803,142.53323,142.4862,142.43922,142.3923,142.34544,142.29861,142.25183,142.20511,142.15845,142.11182,142.06523,142.01869,141.97223,141.9258,141.87941,141.83308,141.78679,141.74054,141.69434,141.6482,141.6021,141.55605,141.51004,141.46408,141.41815,141.37228,141.32646,141.28069,141.23497,141.18929,141.14363,141.09804,141.05249,141.00697,140.96152,140.9161,140.87073,140.82541,140.78012,140.7349,140.6897,140.64455,140.59943,140.55435,140.50934,140.46436,140.41942,140.37451,140.32967,140.28487,140.24008,140.19536,140.15068,140.10602,140.06143,140.01688,139.97234,139.92787,139.88344,139.83905,139.7947,139.75038,139.7061,139.66187,139.61766,139.57352,139.5294,139.48534,139.4413,139.3973,139.35335,139.30943,139.26555,139.22173,139.17792,139.13416,139.09044,139.04674,139.00311,138.9595,138.91592,138.87239,138.82892,138.78545,138.74203,138.69867,138.65532,138.61201,138.56874,138.52551,138.48232,138.43916,138.39604,138.35297,138.3099,13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diff --git a/base/special/acosdf/test/fixtures/julia/positive.json b/base/special/acosdf/test/fixtures/julia/positive.json
new file mode 100644
index 000000000..804ec4aca
--- /dev/null
+++ b/base/special/acosdf/test/fixtures/julia/positive.json
@@ -0,0 +1 @@
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diff --git a/base/special/acosdf/test/fixtures/julia/runner.jl b/base/special/acosdf/test/fixtures/julia/runner.jl
new file mode 100644
index 000000000..17324aa92
--- /dev/null
+++ b/base/special/acosdf/test/fixtures/julia/runner.jl
@@ -0,0 +1,70 @@
+#!/usr/bin/env julia
+#
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import JSON
+
+"""
+    gen( domain, name )
+
+Generate fixture data and write to file.
+
+# Arguments
+
+* `domain`: domain
+* `name::AbstractString`: output filename
+
+# Examples
+
+``` julia
+julia> x = range( -1, stop = 1, length = 2001 );
+julia> gen( x, \"data.json\" );
+```
+"""
+function gen( domain, name )
+	x = collect( domain );
+	y = Float32.( acosd.( Float32.( x ) ) );
+
+	# Store data to be written to file as a collection:
+	data = Dict([
+		("x", x),
+		("expected", y)
+	]);
+
+	# Based on the script directory, create an output filepath:
+	filepath = joinpath( dir, name );
+
+	# Write the data to the output filepath as JSON:
+	outfile = open( filepath, "w" );
+	write( outfile, JSON.json(data) );
+	write( outfile, "\n" );
+	close( outfile );
+end
+
+# Get the filename:
+file = @__FILE__;
+
+# Extract the directory in which this file resides:
+dir = dirname( file );
+
+# Generate fixture data for negative values:
+x = range( -1.0, stop = 0, length = 2003 );
+gen( x, "negative.json" );
+
+# Generate fixture data for positive values:
+x = range( 0, stop = 1.0, length = 2003 );
+gen( x, "positive.json" );
diff --git a/base/special/acosdf/test/test.js b/base/special/acosdf/test/test.js
new file mode 100644
index 000000000..8c6c36a45
--- /dev/null
+++ b/base/special/acosdf/test/test.js
@@ -0,0 +1,119 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var isnanf = require( './../../../../base/assert/is-nanf' );
+var absf = require( './../../../../base/special/absf' );
+var randu = require( '@stdlib/random/base/randu' );
+var EPS = require( '@stdlib/constants/float32/eps' );
+var acosdf = require( './../lib' );
+
+
+// FIXTURES //
+
+var negative = require( './fixtures/julia/negative.json' );
+var positive = require( './fixtures/julia/positive.json' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof acosdf, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function returns `NaN` if provided `NaN`', function test( t ) {
+	var v = acosdf( NaN );
+	t.equal( isnanf( v ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function computes the arccosine in degrees (negative values)', function test( t ) {
+	var expected;
+	var delta;
+	var tol;
+	var x;
+	var y;
+	var i;
+
+	x = negative.x;
+	expected = negative.expected;
+
+	for ( i = 0; i < x.length; i++ ) {
+		y = acosdf( x[i] );
+		if ( y === expected[ i ] ) {
+			t.equal( y, expected[ i ], 'x: '+x[i]+'. E: '+expected[i] );
+		} else {
+			delta = absf( y - expected[i] );
+			tol = 2.8 * EPS * absf( expected[i] );
+			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. y: '+y+'. E: '+expected[i]+'. tol: '+tol+'. Δ: '+delta+'.' );
+		}
+	}
+	t.end();
+});
+
+tape( 'the function computes the arccosine in degrees (positive values)', function test( t ) {
+	var expected;
+	var delta;
+	var tol;
+	var x;
+	var y;
+	var i;
+
+	x = positive.x;
+	expected = positive.expected;
+
+	for ( i = 0; i < x.length; i++ ) {
+		y = acosdf( x[i] );
+		if ( y === expected[ i ] ) {
+			t.equal( y, expected[ i ], 'x: '+x[i]+'. E: '+expected[i] );
+		} else {
+			delta = absf( y - expected[i] );
+			tol = 2.8 * EPS * absf( expected[i] );
+			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. y: '+y+'. E: '+expected[i]+'. tol: '+tol+'. Δ: '+delta+'.' );
+		}
+	}
+	t.end();
+});
+
+tape( 'the function returns `NaN` if provided a value less than `-1`', function test( t ) {
+	var v;
+	var i;
+
+	for ( i = 0; i < 1e3; i++ ) {
+		v = -( randu() * 1.0e6 ) - ( 1.0 - EPS );
+		t.equal( isnanf( acosdf( v ) ), true, 'returns expected value when provided '+v );
+	}
+	t.end();
+});
+
+tape( 'the function returns `NaN` if provided a value greater than `+1`', function test( t ) {
+	var v;
+	var i;
+
+	for ( i = 0; i < 1e3; i++ ) {
+		v = ( randu() * 1.0e6 ) + 1.0 + EPS;
+		t.equal( isnanf( acosdf( v ) ), true, 'returns expected value when provided '+v );
+	}
+	t.end();
+});
diff --git a/base/special/acosdf/test/test.native.js b/base/special/acosdf/test/test.native.js
new file mode 100644
index 000000000..f5ca0b6ce
--- /dev/null
+++ b/base/special/acosdf/test/test.native.js
@@ -0,0 +1,128 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var resolve = require( 'path' ).resolve;
+var tape = require( 'tape' );
+var isnanf = require( './../../../../base/assert/is-nanf' );
+var absf = require( './../../../../base/special/absf' );
+var randu = require( '@stdlib/random/base/randu' );
+var EPS = require( '@stdlib/constants/float32/eps' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+
+
+// VARIABLES //
+
+var acosdf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( acosdf instanceof Error )
+};
+
+
+// FIXTURES //
+
+var negative = require( './fixtures/julia/negative.json' );
+var positive = require( './fixtures/julia/positive.json' );
+
+
+// TESTS //
+
+tape( 'main export is a function', opts, function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof acosdf, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function returns `NaN` if provided `NaN`', opts, function test( t ) {
+	var v = acosdf( NaN );
+	t.equal( isnanf( v ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function computes the arccosine in degrees (negative values)', opts, function test( t ) {
+	var expected;
+	var delta;
+	var tol;
+	var x;
+	var y;
+	var i;
+
+	x = negative.x;
+	expected = negative.expected;
+
+	for ( i = 0; i < x.length; i++ ) {
+		y = acosdf( x[i] );
+		if ( y === expected[ i ] ) {
+			t.equal( y, expected[ i ], 'x: '+x[i]+'. E: '+expected[i] );
+		} else {
+			delta = absf( y - expected[i] );
+			tol = 2.8 * EPS * absf( expected[i] );
+			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. y: '+y+'. E: '+expected[i]+'. tol: '+tol+'. Δ: '+delta+'.' );
+		}
+	}
+	t.end();
+});
+
+tape( 'the function computes the arccosine in degrees (positive values)', opts, function test( t ) {
+	var expected;
+	var delta;
+	var tol;
+	var x;
+	var y;
+	var i;
+
+	x = positive.x;
+	expected = positive.expected;
+
+	for ( i = 0; i < x.length; i++ ) {
+		y = acosdf( x[i] );
+		if ( y === expected[ i ] ) {
+			t.equal( y, expected[ i ], 'x: '+x[i]+'. E: '+expected[i] );
+		} else {
+			delta = absf( y - expected[i] );
+			tol = 2.8 * EPS * absf( expected[i] );
+			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. y: '+y+'. E: '+expected[i]+'. tol: '+tol+'. Δ: '+delta+'.' );
+		}
+	}
+	t.end();
+});
+
+tape( 'the function returns `NaN` if provided a value less than `-1`', opts, function test( t ) {
+	var v;
+	var i;
+
+	for ( i = 0; i < 1e3; i++ ) {
+		v = -( randu() * 1.0e6 ) - ( 1.0 - EPS );
+		t.equal( isnanf( acosdf( v ) ), true, 'returns expected value when provided '+v );
+	}
+	t.end();
+});
+
+tape( 'the function returns `NaN` if provided a value greater than `+1`', opts, function test( t ) {
+	var v;
+	var i;
+
+	for ( i = 0; i < 1e3; i++ ) {
+		v = ( randu() * 1.0e6 ) + 1.0 + EPS;
+		t.equal( isnanf( acosdf( v ) ), true, 'returns expected value when provided '+v );
+	}
+	t.end();
+});