diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2a7ca63..2bedfdf8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -88,7 +88,7 @@
 
 * Improve handling of term boosts across multiple fields [#263](https://github.com/olivernn/lunr.js/issues/263)
 * Enable escaping of special characters when performing a search [#271](https://github.com/olivernn/lunr.js/issues/271)
-* Add ability to programatically include leading and trailing wildcards when performing a query.
+* Add ability to programmatically include leading and trailing wildcards when performing a query.
 
 ## 2.0.4
 
@@ -140,7 +140,7 @@
 * Replace array-like string access with ES3 compatible `String.prototype.charAt` [#186](https://github.com/olivernn/lunr.js/pull/186), thanks [jkellerer](https://github.com/jkellerer).
 * Move empty string filtering from `lunr.trimmer` to `lunr.Pipeline.prototype.run` so that empty tokens do not enter the index, regardless of the trimmer being used [#178](https://github.com/olivernn/lunr.js/issues/178), [#177](https://github.com/olivernn/lunr.js/issues/177) and [#174](https://github.com/olivernn/lunr.js/issues/174)
 * Allow tokenization of arrays with null and non string elements [#172](https://github.com/olivernn/lunr.js/issues/172).
-* Parameterize the seperator used by `lunr.tokenizer`, fixes [#102](https://github.com/olivernn/lunr.js/issues/102).
+* Parameterize the separator used by `lunr.tokenizer`, fixes [#102](https://github.com/olivernn/lunr.js/issues/102).
 
 ## 0.5.12
 
@@ -161,7 +161,7 @@
 ## 0.5.9
 
 * Remove recursion from SortedSet#indexOf and SortedSet#locationFor to gain small performance gains in Index#search and Index#add
-* Fix incorrect handling of non existant functions when adding/removing from a Pipeline [#146](https://github.com/olivernn/lunr.js/issues/146) thanks to [weixsong](https://github.com/weixsong)
+* Fix incorrect handling of non-existent functions when adding/removing from a Pipeline [#146](https://github.com/olivernn/lunr.js/issues/146) thanks to [weixsong](https://github.com/weixsong)
 
 ## 0.5.8
 
@@ -245,7 +245,7 @@
 
 ## 0.3.1
 
-* Fix bug [#24](https://github.com/olivernn/lunr.js/pull/24) that caused an error when trying to remove a non-existant document from the index, thanks [Jesús Leganés Combarro](https://github.com/piranna)
+* Fix bug [#24](https://github.com/olivernn/lunr.js/pull/24) that caused an error when trying to remove a non-existent document from the index, thanks [Jesús Leganés Combarro](https://github.com/piranna)
 
 ## 0.3.0
 
diff --git a/build/wrapper_end b/build/wrapper_end
index 380dd453..3880b536 100644
--- a/build/wrapper_end
+++ b/build/wrapper_end
@@ -10,7 +10,7 @@
     } else if (typeof exports === 'object') {
       /**
        * Node. Does not work with strict CommonJS, but
-       * only CommonJS-like enviroments that support module.exports,
+       * only CommonJS-like environments that support module.exports,
        * like Node.
        */
       module.exports = factory()
diff --git a/lunr.js b/lunr.js
index 6aa370fb..aca0a167 100644
--- a/lunr.js
+++ b/lunr.js
@@ -3456,7 +3456,7 @@ lunr.QueryParser.parseBoost = function (parser) {
     } else if (typeof exports === 'object') {
       /**
        * Node. Does not work with strict CommonJS, but
-       * only CommonJS-like enviroments that support module.exports,
+       * only CommonJS-like environments that support module.exports,
        * like Node.
        */
       module.exports = factory()
diff --git a/test/env/chai.js b/test/env/chai.js
index 1d30296a..fcf1c78e 100644
--- a/test/env/chai.js
+++ b/test/env/chai.js
@@ -272,7 +272,7 @@ module.exports = {
    *
    * Set it to zero if you want to disable truncating altogether.
    *
-   * This is especially userful when doing assertions on arrays: having this
+   * This is especially useful when doing assertions on arrays: having this
    * set to a reasonable large value makes the failure messages readily
    * inspectable.
    *
@@ -4381,7 +4381,7 @@ module.exports = function getEnumerableProperties(object) {
  */
 
 /*!
- * Module dependancies
+ * Module dependencies
  */
 
 var flag = require('./flag')
@@ -4855,7 +4855,7 @@ var getEnumerableProperties = require('./getEnumerableProperties');
 module.exports = inspect;
 
 /**
- * Echos the value of a value. Trys to print the value out
+ * Echos the value of a value. Tries to print the value out
  * in the best way possible given the different types.
  *
  * @param {Object} obj The object to print out.
@@ -5189,7 +5189,7 @@ function objectToString(o) {
  */
 
 /*!
- * Module dependancies
+ * Module dependencies
  */
 
 var inspect = require('./inspect');
@@ -5243,7 +5243,7 @@ module.exports = function (obj) {
 /**
  * ### overwriteChainableMethod (ctx, name, method, chainingBehavior)
  *
- * Overwites an already existing chainable method
+ * Overwrites an already existing chainable method
  * and provides access to the previous function or
  * property.  Must return functions to be used for
  * name.
@@ -5299,7 +5299,7 @@ module.exports = function (ctx, name, method, chainingBehavior) {
 /**
  * ### overwriteMethod (ctx, name, fn)
  *
- * Overwites an already existing method and provides
+ * Overwrites an already existing method and provides
  * access to previous function. Must return function
  * to be used for name.
  *
@@ -5353,7 +5353,7 @@ module.exports = function (ctx, name, method) {
 /**
  * ### overwriteProperty (ctx, name, fn)
  *
- * Overwites an already existing property getter and provides
+ * Overwrites an already existing property getter and provides
  * access to previous value. Must return function to use as getter.
  *
  *     utils.overwriteProperty(chai.Assertion.prototype, 'ok', function (_super) {
@@ -5408,7 +5408,7 @@ module.exports = function (ctx, name, getter) {
  */
 
 /*!
- * Module dependancies
+ * Module dependencies
  */
 
 var flag = require('./flag');
@@ -6139,4 +6139,4 @@ Library.prototype.test = function(obj, type) {
 };
 
 },{}]},{},[1])(1)
-});
\ No newline at end of file
+});
diff --git a/test/env/mocha.js b/test/env/mocha.js
index c9224e3b..979e265e 100644
--- a/test/env/mocha.js
+++ b/test/env/mocha.js
@@ -2037,7 +2037,7 @@ exports.cursor = {
 };
 
 /**
- * Outut the given `failures` as a list.
+ * Output the given `failures` as a list.
  *
  * @param {Array} failures
  * @api public
@@ -7055,7 +7055,7 @@ function alloc (that, size, fill, encoding) {
   if (fill !== undefined) {
     // Only pay attention to encoding if it's a string. This
     // prevents accidentally sending in a number that would
-    // be interpretted as a start offset.
+    // be interpreted as a start offset.
     return typeof encoding === 'string'
       ? createBuffer(that, size).fill(fill, encoding)
       : createBuffer(that, size).fill(fill)
@@ -7344,7 +7344,7 @@ function slowToString (encoding, start, end) {
     return ''
   }
 
-  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
+  // Force coercion to uint32. This will also coerce falsey/NaN values to 0.
   end >>>= 0
   start >>>= 0
 
@@ -9781,7 +9781,7 @@ exports.version = '1.4.1'
  *  - sticky  Make the notification stick (defaults to false)
  *  - priority  Specify an int or named key (default is 0)
  *  - name    Application name (defaults to growlnotify)
- *  - sound   Sound efect ( in OSx defined in preferences -> sound -> effects) * works only in OSX > 10.8x
+ *  - sound   Sound effect ( in OSx defined in preferences -> sound -> effects) * works only in OSX > 10.8x
  *  - image
  *    - path to an icon sets --iconpath
  *    - path to an image sets --image
@@ -12375,7 +12375,7 @@ process.nextTick = function (fun) {
     }
 };
 
-// v8 likes predictible objects
+// v8 likes predictable objects
 function Item(fun, array) {
     this.fun = fun;
     this.array = array;
@@ -14700,7 +14700,7 @@ exports.debuglog = function(set) {
 
 
 /**
- * Echos the value of a value. Trys to print the value out
+ * Echos the value of a value. Tries to print the value out
  * in the best way possible given the different types.
  *
  * @param {Object} obj The object to print out.
diff --git a/test/pipeline_test.js b/test/pipeline_test.js
index f080bf9d..8bd072bd 100644
--- a/test/pipeline_test.js
+++ b/test/pipeline_test.js
@@ -257,7 +257,7 @@ suite('lunr.Pipeline', function () {
       assert.equal(fn, pipeline._stack[0])
     })
 
-    test('with unregisterd functions', function () {
+    test('with unregistered functions', function () {
       var serializedPipeline = ['fn']
 
       assert.throws(function () {