diff --git a/wp-admin/includes/class-wp-upgrader.php b/wp-admin/includes/class-wp-upgrader.php
index 0d53118668..120e571bd7 100644
--- a/wp-admin/includes/class-wp-upgrader.php
+++ b/wp-admin/includes/class-wp-upgrader.php
@@ -2089,7 +2089,7 @@ class WP_Automatic_Updater {
 				return;
 		}
 
-		// Update the lock, as by this point we've definately got a lock, just need to fire the actions
+		// Update the lock, as by this point we've definitely got a lock, just need to fire the actions
 		update_option( $lock_name, time() );
 
 		// Don't automatically run these thins, as we'll handle it ourselves
diff --git a/wp-admin/includes/theme.php b/wp-admin/includes/theme.php
index 180b5cc142..eaef0bcdf6 100644
--- a/wp-admin/includes/theme.php
+++ b/wp-admin/includes/theme.php
@@ -282,7 +282,7 @@ function get_theme_feature_list( $api = true ) {
  * It is possible for a theme to override the Themes API result with three
  * filters. Assume this is for themes, which can extend on the Theme Info to
  * offer more choices. This is very powerful and must be used with care, when
- * overridding the filters.
+ * overriding the filters.
  *
  * The first filter, 'themes_api_args', is for the args and gives the action as
  * the second parameter. The hook for 'themes_api_args' must ensure that an
diff --git a/wp-includes/class-IXR.php b/wp-includes/class-IXR.php
index f576719c87..b0a0f28d99 100644
--- a/wp-includes/class-IXR.php
+++ b/wp-includes/class-IXR.php
@@ -358,7 +358,7 @@ class IXR_Message
                     $this->_arraystructs[count($this->_arraystructs)-1][] = $value;
                 }
             } else {
-                // Just add as a paramater
+                // Just add as a parameter
                 $this->params[] = $value;
             }
         }
@@ -451,7 +451,7 @@ EOD;
 
         // Perform the callback and send the response
         if (count($args) == 1) {
-            // If only one paramater just send that instead of the whole array
+            // If only one parameter just send that instead of the whole array
             $args = $args[0];
         }
 
diff --git a/wp-includes/class-http.php b/wp-includes/class-http.php
index 8e5d635bd9..4dee414262 100644
--- a/wp-includes/class-http.php
+++ b/wp-includes/class-http.php
@@ -727,7 +727,7 @@ class WP_Http {
 	 * @since 3.7.0
 	 *
 	 * @param string $url The URL which was requested.
-	 * @param array $args The Arguements which were used to make the request.
+	 * @param array $args The Arguments which were used to make the request.
 	 * @param array $response The Response of the HTTP request.
 	 * @return false|object False if no redirect is present, a WP_HTTP or WP_Error result otherwise.
 	 */
@@ -1430,7 +1430,7 @@ class WP_Http_Curl {
 
 		$curl_error = curl_errno( $handle );
 
-		// If an error occured, or, no response.
+		// If an error occurred, or, no response.
 		if ( $curl_error || ( 0 == strlen( $theBody ) && empty( $theHeaders['headers'] ) ) ) {
 			if ( CURLE_WRITE_ERROR /* 23 */ == $curl_error &&  $r['stream'] ) {
 				fclose( $this->stream_handle );
diff --git a/wp-includes/class-simplepie.php b/wp-includes/class-simplepie.php
index e7281c9e35..64f9fa9be4 100644
--- a/wp-includes/class-simplepie.php
+++ b/wp-includes/class-simplepie.php
@@ -1612,7 +1612,7 @@ class SimplePie
 	}
 
 	/**
-	 * Get the error message for the occured error
+	 * Get the error message for the occurred error.
 	 *
 	 * @return string|array Error message, or array of messages for multifeeds
 	 */
diff --git a/wp-includes/class-wp-walker.php b/wp-includes/class-wp-walker.php
index 3c73457d53..25191641c0 100644
--- a/wp-includes/class-wp-walker.php
+++ b/wp-includes/class-wp-walker.php
@@ -40,7 +40,7 @@ class Walker {
 	protected $max_pages = 1;
 
 	/**
-	 * Wether the current element has children or not.
+	 * Whether the current element has children or not.
 	 *
 	 * To be used in start_el().
 	 *
diff --git a/wp-includes/date.php b/wp-includes/date.php
index 0fbf0423e0..a060239ea3 100644
--- a/wp-includes/date.php
+++ b/wp-includes/date.php
@@ -84,7 +84,7 @@ class WP_Date_Query {
 	 *                                     Default (string:empty)|(array:last day of month). Accepts numbers 1-31.
 	 *             }
 	 *             @type string       $column    Optional. Used to add a clause comparing a column other than the column
-	 *                                           specified in the top-level $column paramater.  Default is the value
+	 *                                           specified in the top-level $column parameter.  Default is the value
 	 *                                           of top-level $column. Accepts 'post_date', 'post_date_gmt',
 	 *                                           'post_modified', 'post_modified_gmt', 'comment_date', 'comment_date_gmt'.
 	 *             @type string       $compare   Optional. The comparison operator. Default '='. Accepts '=', '!=',
diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index becc24a175..3828c6abc2 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -227,27 +227,27 @@ function wptexturize($text, $reset = false) {
 	$textarr = preg_split( $regex, $text, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
 
 	foreach ( $textarr as &$curl ) {
-		// Only call _wptexturize_pushpop_element if $curl is a delimeter.
+		// Only call _wptexturize_pushpop_element if $curl is a delimiter.
 		$first = $curl[0];
 		if ( '<' === $first && '>' === substr( $curl, -1 ) ) {
-			// This is an HTML delimeter.
+			// This is an HTML delimiter.
 
 			if ( '<!--' !== substr( $curl, 0, 4 ) ) {
 				_wptexturize_pushpop_element( $curl, $no_texturize_tags_stack, $no_texturize_tags );
 			}
 
 		} elseif ( '' === trim( $curl ) ) {
-			// This is a newline between delimeters.  Performance improves when we check this.
+			// This is a newline between delimiters.  Performance improves when we check this.
 
 			continue;
 
 		} elseif ( '[' === $first && 1 === preg_match( '/^\[(?:[^\[\]<>]|<[^>]+>)++\]$/', $curl ) ) {
-			// This is a shortcode delimeter.
+			// This is a shortcode delimiter.
 
 			_wptexturize_pushpop_element( $curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes );
 
 		} elseif ( '[' === $first && 1 === preg_match( '/^\[\[?(?:[^\[\]<>]|<[^>]+>)++\]\]?$/', $curl ) ) {
-			// This is an escaped shortcode delimeter.
+			// This is an escaped shortcode delimiter.
 
 			// Do not texturize.
 			// Do not push to the shortcodes stack.
@@ -255,7 +255,7 @@ function wptexturize($text, $reset = false) {
 			continue;
 
 		} elseif ( empty( $no_texturize_shortcodes_stack ) && empty( $no_texturize_tags_stack ) ) {
-			// This is neither a delimeter, nor is this content inside of no_texturize pairs.  Do texturize.
+			// This is neither a delimiter, nor is this content inside of no_texturize pairs.  Do texturize.
 
 			$curl = str_replace( $static_characters, $static_replacements, $curl );
 
diff --git a/wp-includes/js/heartbeat.js b/wp-includes/js/heartbeat.js
index c097973f13..63ee4f523c 100644
--- a/wp-includes/js/heartbeat.js
+++ b/wp-includes/js/heartbeat.js
@@ -63,7 +63,7 @@
 				// Whether a connection is currently in progress
 				connecting: false,
 
-				// Whether a connection error occured
+				// Whether a connection error occurred
 				connectionError: false,
 
 				// Used to track non-critical errors
diff --git a/wp-includes/js/media-audiovideo.js b/wp-includes/js/media-audiovideo.js
index c971469bfb..73f81a8820 100644
--- a/wp-includes/js/media-audiovideo.js
+++ b/wp-includes/js/media-audiovideo.js
@@ -617,7 +617,7 @@
 	/**
 	 * wp.media.view.MediaDetails
 	 *
-	 * @contructor
+	 * @constructor
 	 * @augments wp.media.view.Settings.AttachmentDisplay
 	 * @augments wp.media.view.Settings
 	 * @augments wp.media.View
@@ -762,7 +762,7 @@
 	/**
 	 * wp.media.view.AudioDetails
 	 *
-	 * @contructor
+	 * @constructor
 	 * @augments wp.media.view.MediaDetails
 	 * @augments wp.media.view.Settings.AttachmentDisplay
 	 * @augments wp.media.view.Settings
@@ -794,7 +794,7 @@
 	/**
 	 * wp.media.view.VideoDetails
 	 *
-	 * @contructor
+	 * @constructor
 	 * @augments wp.media.view.MediaDetails
 	 * @augments wp.media.view.Settings.AttachmentDisplay
 	 * @augments wp.media.view.Settings
diff --git a/wp-includes/js/media-views.js b/wp-includes/js/media-views.js
index 6180d4ff13..3e90761046 100644
--- a/wp-includes/js/media-views.js
+++ b/wp-includes/js/media-views.js
@@ -6784,7 +6784,7 @@
 	/**
 	 * wp.media.view.EmbedImage
 	 *
-	 * @contructor
+	 * @constructor
 	 * @augments wp.media.view.Settings.AttachmentDisplay
 	 * @augments wp.media.view.Settings
 	 * @augments wp.media.View
@@ -6811,7 +6811,7 @@
 	/**
 	 * wp.media.view.ImageDetails
 	 *
-	 * @contructor
+	 * @constructor
 	 * @augments wp.media.view.Settings.AttachmentDisplay
 	 * @augments wp.media.view.Settings
 	 * @augments wp.media.View
diff --git a/wp-includes/js/swfupload/swfupload.js b/wp-includes/js/swfupload/swfupload.js
index e65b19cb29..9c950d4ed7 100644
--- a/wp-includes/js/swfupload/swfupload.js
+++ b/wp-includes/js/swfupload/swfupload.js
@@ -3,7 +3,7 @@
  *
  * mmSWFUpload 1.0: Flash upload dialog - http://profandesign.se/swfupload/,  http://www.vinterwebb.se/
  *
- * SWFUpload is (c) 2006-2007 Lars Huring, Olov Nilzén and Mammon Media and is released under the MIT License:
+ * SWFUpload is (c) 2006-2007 Lars Huring, Olov Nilz�n and Mammon Media and is released under the MIT License:
  * http://www.opensource.org/licenses/mit-license.php
  *
  * SWFUpload 2 is (c) 2007-2008 Jake Roberts and is released under the MIT License:
diff --git a/wp-includes/js/thickbox/thickbox.js b/wp-includes/js/thickbox/thickbox.js
index 6cbefb21c8..5bca4b1295 100644
--- a/wp-includes/js/thickbox/thickbox.js
+++ b/wp-includes/js/thickbox/thickbox.js
@@ -105,7 +105,7 @@ function tb_show(caption, url, imageGroup) {//function called when the user clic
 			imgPreloader.onload = function(){
 			imgPreloader.onload = null;
 
-			// Resizing large images - orginal by Christian Montoya edited by me.
+			// Resizing large images - original by Christian Montoya edited by me.
 			var pagesize = tb_getPageSize();
 			var x = pagesize[0] - 150;
 			var y = pagesize[1] - 150;
@@ -186,8 +186,8 @@ function tb_show(caption, url, imageGroup) {//function called when the user clic
 			var queryString = url.replace(/^[^\?]+\??/,'');
 			var params = tb_parseQuery( queryString );
 
-			TB_WIDTH = (params['width']*1) + 30 || 630; //defaults to 630 if no paramaters were added to URL
-			TB_HEIGHT = (params['height']*1) + 40 || 440; //defaults to 440 if no paramaters were added to URL
+			TB_WIDTH = (params['width']*1) + 30 || 630; //defaults to 630 if no parameters were added to URL
+			TB_HEIGHT = (params['height']*1) + 40 || 440; //defaults to 440 if no parameters were added to URL
 			ajaxContentW = TB_WIDTH - 30;
 			ajaxContentH = TB_HEIGHT - 45;
 
diff --git a/wp-includes/pomo/translations.php b/wp-includes/pomo/translations.php
index 106b6da164..5ad316c08e 100644
--- a/wp-includes/pomo/translations.php
+++ b/wp-includes/pomo/translations.php
@@ -172,7 +172,7 @@ class Gettext_Translations extends Translations {
 	}
 
 	/**
-	 * Adds parantheses to the inner parts of ternary operators in
+	 * Adds parentheses to the inner parts of ternary operators in
 	 * plural expressions, because PHP evaluates ternary oerators from left to right
 	 *
 	 * @param string $expression the expression without parentheses
diff --git a/wp-includes/rss.php b/wp-includes/rss.php
index ab6ead0f2c..7759003c65 100644
--- a/wp-includes/rss.php
+++ b/wp-includes/rss.php
@@ -247,7 +247,7 @@ class MagpieRSS {
 		}
 		elseif ($this->feed_type == ATOM and $this->incontent  ) {
 			// balance tags properly
-			// note:  i don't think this is actually neccessary
+			// note: This may not actually be necessary
 			if ( $this->stack[0] == $el )
 			{
 				$this->append_content("</$el>");
@@ -724,7 +724,7 @@ class RSSCache {
 	Function:	set
 	Purpose:	add an item to the cache, keyed on url
 	Input:		url from wich the rss file was fetched
-	Output:		true on sucess
+	Output:		true on success
 \*=======================================================================*/
 	function set ($url, $rss) {
 		$cache_option = 'rss_' . $this->file_name( $url );
diff --git a/wp-includes/wp-diff.php b/wp-includes/wp-diff.php
index 7af95e825f..4901a4376b 100644
--- a/wp-includes/wp-diff.php
+++ b/wp-includes/wp-diff.php
@@ -414,7 +414,7 @@ class WP_Text_Diff_Renderer_Table extends Text_Diff_Renderer {
 		if ( !$string1 )
 			return $difference;
 
-		// Return distance per charcter (of string1)
+		// Return distance per character (of string1).
 		return $difference / strlen($string1);
 	}