diff --git a/wp-admin/includes/class-wp-filesystem-base.php b/wp-admin/includes/class-wp-filesystem-base.php
index 87fae2a6c9..d501a307e3 100644
--- a/wp-admin/includes/class-wp-filesystem-base.php
+++ b/wp-admin/includes/class-wp-filesystem-base.php
@@ -13,7 +13,7 @@
  */
 class WP_Filesystem_Base {
 	/**
-	 * Whether to display debug data for the connection or not.
+	 * Whether to display debug data for the connection.
 	 *
 	 * @since 2.5
 	 * @access public
diff --git a/wp-admin/includes/misc.php b/wp-admin/includes/misc.php
index 9ed1b07dea..a9d7d8a768 100644
--- a/wp-admin/includes/misc.php
+++ b/wp-admin/includes/misc.php
@@ -128,7 +128,7 @@ function save_mod_rewrite_rules() {
 	$home_path = get_home_path();
 	$htaccess_file = $home_path.'.htaccess';
 
-	// If the file doesn't already exists check for write access to the directory and whether of not we have some rules.
+	// If the file doesn't already exists check for write access to the directory and whether we have some rules.
 	// else check for write access to the file.
 	if ((!file_exists($htaccess_file) && is_writable($home_path) && $wp_rewrite->using_mod_rewrite_permalinks()) || is_writable($htaccess_file)) {
 		if ( got_mod_rewrite() ) {
@@ -359,7 +359,7 @@ jQuery('#codepress-off').show();
 }
 
 /**
- * Determine whether to use CodePress or not.
+ * Determine whether to use CodePress.
  *
  * @since 2.8
 **/
diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index 1092d80096..92f8ff1f3c 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -180,7 +180,7 @@ function link_cat_row( $category, $name_override = false ) {
  *
  * @param any $checked One of the values to compare
  * @param any $current (true) The other value to compare if not just true
- * @param bool $echo Whether or not to echo or just return the string
+ * @param bool $echo Whether to echo or just return the string
  */
 function checked( $checked, $current = true, $echo = true) {
 	return __checked_selected_helper( $checked, $current, $echo, 'checked' );
@@ -195,7 +195,7 @@ function checked( $checked, $current = true, $echo = true) {
  *
  * @param any selected One of the values to compare
  * @param any $current (true) The other value to compare if not just true
- * @param bool $echo Whether or not to echo or just return the string
+ * @param bool $echo Whether to echo or just return the string
  */
 function selected( $selected, $current = true, $echo = true) {
 	return __checked_selected_helper( $selected, $current, $echo, 'selected' );
@@ -211,7 +211,7 @@ function selected( $selected, $current = true, $echo = true) {
  *
  * @param any $helper One of the values to compare
  * @param any $current (true) The other value to compare if not just true
- * @param bool $echo Whether or not to echo or just return the string
+ * @param bool $echo Whether to echo or just return the string
  * @param string $type The type of checked|selected we are doing.
  */
 function __checked_selected_helper( $helper, $current, $echo, $type) {
diff --git a/wp-content/themes/default/header.php b/wp-content/themes/default/header.php
index 43b729b497..5b98a60c9e 100644
--- a/wp-content/themes/default/header.php
+++ b/wp-content/themes/default/header.php
@@ -18,7 +18,7 @@
 <style type="text/css" media="screen">
 
 <?php
-// Checks to see whether it needs a sidebar or not
+// Checks to see whether it needs a sidebar
 if ( empty($withcomments) && !is_single() ) {
 ?>
 	#page { background: url("<?php bloginfo('stylesheet_directory'); ?>/images/kubrickbg-<?php bloginfo('text_direction'); ?>.jpg") repeat-y top; border: none; }
diff --git a/wp-includes/capabilities.php b/wp-includes/capabilities.php
index 89cc5befdb..9e4a9289e7 100644
--- a/wp-includes/capabilities.php
+++ b/wp-includes/capabilities.php
@@ -272,7 +272,7 @@ class WP_Role {
 	 * PHP4 Constructor - Setup object properties.
 	 *
 	 * The list of capabilities, must have the key as the name of the capability
-	 * and the value a boolean of whether it is granted to the role or not.
+	 * and the value a boolean of whether it is granted to the role.
 	 *
 	 * @since 2.0.0
 	 * @access public
diff --git a/wp-includes/category.php b/wp-includes/category.php
index b2c05d273c..ee3d9432ee 100644
--- a/wp-includes/category.php
+++ b/wp-includes/category.php
@@ -100,7 +100,7 @@ function &get_category( $category, $output = OBJECT, $filter = 'raw' ) {
  * @since 2.1.0
  *
  * @param string $category_path URL containing category slugs.
- * @param bool $full_match Optional. Whether should match full path or not.
+ * @param bool $full_match Optional. Whether full path should be matched.
  * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
  * @return null|object|array Null on failure. Type is based on $output value.
  */
diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index 57af6df6ce..993293408c 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -931,7 +931,7 @@ function comments_template( $file = '/comments.php', $separate_comments = false
  *
  * @since 0.71
  * @global string $wpcommentspopupfile The URL to use for the popup window
- * @global int $wpcommentsjavascript Whether to use JavaScript or not. Set when function is called
+ * @global int $wpcommentsjavascript Whether to use JavaScript. Set when function is called
  *
  * @param int $width Optional. The width of the popup window
  * @param int $height Optional. The height of the popup window
diff --git a/wp-includes/comment.php b/wp-includes/comment.php
index e3499c802c..1403cba9b6 100644
--- a/wp-includes/comment.php
+++ b/wp-includes/comment.php
@@ -526,7 +526,7 @@ function sanitize_comment_cookies() {
 }
 
 /**
- * Validates whether this comment is allowed to be made or not.
+ * Validates whether this comment is allowed to be made.
  *
  * @since 2.0.0
  * @uses $wpdb
diff --git a/wp-includes/deprecated.php b/wp-includes/deprecated.php
index 2341190269..a7c7e1958d 100644
--- a/wp-includes/deprecated.php
+++ b/wp-includes/deprecated.php
@@ -1255,8 +1255,8 @@ function gzip_compression() {
  * @see get_comment()
  *
  * @param int $comment_ID The ID of the comment
- * @param int $no_cache Whether to use the cache or not (casted to bool)
- * @param bool $include_unapproved Whether to include unapproved comments or not
+ * @param int $no_cache Whether to use the cache (casted to bool)
+ * @param bool $include_unapproved Whether to include unapproved comments
  * @return array The comment data
  */
 function get_commentdata( $comment_ID, $no_cache = 0, $include_unapproved = false ) {
diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index 2509e04ad2..ba6da06124 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -287,7 +287,7 @@ function seems_utf8($str) {
  * @param string $string The text which is to be encoded.
  * @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.
  * @param string $charset Optional. The character encoding of the string. Default is false.
- * @param boolean $double_encode Optional. Whether or not to encode existing html entities. Default is false.
+ * @param boolean $double_encode Optional. Whether to encode existing html entities. Default is false.
  * @return string The encoded text with HTML entities.
  */
 function _wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {
@@ -1110,7 +1110,7 @@ function force_balance_tags( $text ) {
  * @since 0.71
  *
  * @param string $content The text about to be edited.
- * @param bool $richedit Whether or not the $content should pass through htmlspecialchars(). Default false.
+ * @param bool $richedit Whether the $content should pass through htmlspecialchars(). Default false.
  * @return string The text after the filter (and possibly htmlspecialchars()) has been run.
  */
 function format_to_edit($content, $richedit = false) {
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index e738c78875..fa75e7946f 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1823,7 +1823,7 @@ function is_blog_installed() {
 	$tables = $wpdb->get_col('SHOW TABLES');
 	$wpdb->suppress_errors( $suppress );
 
-	$wp_tables = $wpdb->tables( 'all', true );
+	$wp_tables = $wpdb->tables( 'all' );
 	// Loop over the WP tables.  If none exist, then scratch install is allowed.
 	// If one or more exist, suggest table repair since we got here because the options
 	// table could not be accessed.
@@ -1995,7 +1995,7 @@ function wp_get_original_referer() {
  * @since 2.0.1
  *
  * @param string $target Full path to attempt to create.
- * @return bool Whether the path was created or not. True if path already exists.
+ * @return bool Whether the path was created. True if path already exists.
  */
 function wp_mkdir_p( $target ) {
 	// from php.net/mkdir user contributed notes
@@ -3028,7 +3028,7 @@ function absint( $maybeint ) {
  * @since 2.5.0
  *
  * @param string $url
- * @return bool Whether or not SSL access is available
+ * @return bool Whether SSL access is available
  */
 function url_is_accessable_via_ssl($url)
 {
diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index 97b83879eb..ce4c75f2c1 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -168,7 +168,7 @@ function get_search_form($echo = true) {
  * Display the Log In/Out link.
  *
  * Displays a link, which allows the user to navigate to the Log In page to log in
- * or log out depending on whether or not they are currently logged in.
+ * or log out depending on whether they are currently logged in.
  *
  * @since 1.5.0
  * @uses apply_filters() Calls 'loginout' hook on HTML link content.
@@ -1436,9 +1436,9 @@ function get_the_time( $d = '', $post = null ) {
  * @since 2.0.0
  *
  * @param string $d Optional Either 'G', 'U', or php date format.
- * @param bool $gmt Optional, default is false. Whether of not to return the gmt time.
+ * @param bool $gmt Optional, default is false. Whether to return the gmt time.
  * @param int|object $post Optional post ID or object. Default is global $post object.
- * @param bool $translate Whether to translate the time string or not
+ * @param bool $translate Whether to translate the time string
  * @return string
  */
 function get_post_time( $d = 'U', $gmt = false, $post = null, $translate = false ) { // returns timestamp
@@ -1486,9 +1486,9 @@ function get_the_modified_time($d = '') {
  * @since 2.0.0
  *
  * @param string $d Optional, default is 'U'. Either 'G', 'U', or php date format.
- * @param bool $gmt Optional, default is false. Whether of not to return the gmt time.
+ * @param bool $gmt Optional, default is false. Whether to return the gmt time.
  * @param int|object $post Optional, default is global post object. A post_id or post object
- * @param bool $translate Optional, default is false. Whether to translate the result or not
+ * @param bool $translate Optional, default is false. Whether to translate the result
  * @return string Returns timestamp
  */
 function get_post_modified_time( $d = 'U', $gmt = false, $post = null, $translate = false ) {
@@ -1699,7 +1699,7 @@ function noindex() {
  *
  * @since 2.1.0
  *
- * @return bool Whether of not TinyMCE exists.
+ * @return bool Whether TinyMCE exists.
  */
 function rich_edit_exists() {
 	global $wp_rich_edit_exists;
@@ -1709,7 +1709,7 @@ function rich_edit_exists() {
 }
 
 /**
- * Whether or not the user should have a WYSIWIG editor.
+ * Whether the user should have a WYSIWIG editor.
  *
  * Checks that the user requires a WYSIWIG editor and that the editor is
  * supported in the users browser.
diff --git a/wp-includes/kses.php b/wp-includes/kses.php
index e7675827e7..29046f19d5 100644
--- a/wp-includes/kses.php
+++ b/wp-includes/kses.php
@@ -739,10 +739,10 @@ function wp_kses_hair($attr, $allowed_protocols) {
  * @since 1.0.0
  *
  * @param string $value Attribute value
- * @param string $vless Whether the value is valueless or not. Use 'y' or 'n'
+ * @param string $vless Whether the value is valueless. Use 'y' or 'n'
  * @param string $checkname What $checkvalue is checking for.
  * @param mixed $checkvalue What constraint the value should pass
- * @return bool Whether check passes (true) or not (false)
+ * @return bool Whether check passes
  */
 function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) {
 	$ok = true;
diff --git a/wp-includes/media.php b/wp-includes/media.php
index 72ff9c0466..1b1959fbed 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -1316,7 +1316,7 @@ function wp_oembed_get( $url, $args = '' ) {
  *
  * @param string $format The format of URL that this provider can handle. You can use asterisks as wildcards.
  * @param string $provider The URL to the oEmbed provider.
- * @param boolean $regex Whether the $format parameter is in a regex format or not.
+ * @param boolean $regex Whether the $format parameter is in a regex format.
  */
 function wp_oembed_add_provider( $format, $provider, $regex = false ) {
 	require_once( 'class-oembed.php' );
diff --git a/wp-includes/pluggable.php b/wp-includes/pluggable.php
index 7b90df3cfb..6da34fdb6e 100644
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -405,7 +405,7 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 
 	$phpmailer->ContentType = $content_type;
 
-	// Set whether it's plaintext or not, depending on $content_type
+	// Set whether it's plaintext, depending on $content_type
 	if ( $content_type == 'text/html' ) {
 		$phpmailer->IsHTML( true );
 	}
@@ -633,7 +633,7 @@ if ( !function_exists('wp_set_auth_cookie') ) :
  * @since 2.5
  *
  * @param int $user_id User ID
- * @param bool $remember Whether to remember the user or not
+ * @param bool $remember Whether to remember the user
  */
 function wp_set_auth_cookie($user_id, $remember = false, $secure = '') {
 	if ( $remember ) {
diff --git a/wp-includes/post-template.php b/wp-includes/post-template.php
index 181f360b90..d93121fd33 100644
--- a/wp-includes/post-template.php
+++ b/wp-includes/post-template.php
@@ -1005,8 +1005,8 @@ function get_the_password_form() {
 /**
  * Whether currently in a page template.
  *
- * This template tag allows you to determine whether or not you are in a page
- * template. You can optional provide a template name and then the check will be
+ * This template tag allows you to determine if you are in a page template.
+ * You can optional provide a template name and then the check will be
  * specific to that template.
  *
  * @since 2.5.0
diff --git a/wp-includes/post-thumbnail-template.php b/wp-includes/post-thumbnail-template.php
index b3ba6e80fd..547d4e1707 100644
--- a/wp-includes/post-thumbnail-template.php
+++ b/wp-includes/post-thumbnail-template.php
@@ -15,7 +15,7 @@
  * @since 2.9.0
  *
  * @param int $post_id Optional. Post ID.
- * @return bool Whether post has an image attached (true) or not (false).
+ * @return bool Whether post has an image attached.
  */
 function has_post_thumbnail( $post_id = NULL ) {
 	global $id;
diff --git a/wp-includes/post.php b/wp-includes/post.php
index f6a1906aa1..dbe213e92a 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -132,7 +132,7 @@ add_action( 'init', 'create_initial_post_types', 0 ); // highest priority
  * @uses apply_filters() Calls 'get_attached_file' on file path and attachment ID.
  *
  * @param int $attachment_id Attachment ID.
- * @param bool $unfiltered Whether to apply filters or not.
+ * @param bool $unfiltered Whether to apply filters.
  * @return string The file path to the attached file.
  */
 function get_attached_file( $attachment_id, $unfiltered = false ) {
@@ -1198,7 +1198,7 @@ function get_post_custom_values( $key = '', $post_id = 0 ) {
  * @since 2.7.0
  *
  * @param int $post_id Optional. Post ID.
- * @return bool Whether post is sticky (true) or not sticky (false).
+ * @return bool Whether post is sticky.
  */
 function is_sticky($post_id = null) {
 	global $id;
diff --git a/wp-includes/registration.php b/wp-includes/registration.php
index 96f8a05ab3..64937f4623 100644
--- a/wp-includes/registration.php
+++ b/wp-includes/registration.php
@@ -83,7 +83,7 @@ function validate_username( $username ) {
  * 'first_name' - The user's first name.
  * 'last_name' - The user's last name.
  * 'description' - A string containing content about the user.
- * 'rich_editing' - A string for whether to enable the rich editor or not. False
+ * 'rich_editing' - A string for whether to enable the rich editor. False
  *		if not empty.
  * 'user_registered' - The date the user registered. Format is 'Y-m-d H:i:s'.
  * 'role' - A string used to set the user's role.
diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index e278b4a27d..a5efa7a5ed 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -128,7 +128,7 @@ function get_taxonomy( $taxonomy ) {
  * @uses $wp_taxonomies
  *
  * @param string $taxonomy Name of taxonomy object
- * @return bool Whether the taxonomy exists or not.
+ * @return bool Whether the taxonomy exists.
  */
 function is_taxonomy( $taxonomy ) {
 	global $wp_taxonomies;
diff --git a/wp-includes/user.php b/wp-includes/user.php
index 2b5dacf1d2..3a63eba8f6 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -260,7 +260,7 @@ function get_user_option( $option, $user = 0, $deprecated = '' ) {
  * @param int $user_id User ID
  * @param string $option_name User option name.
  * @param mixed $newvalue User option value.
- * @param bool $global Optional. Whether option name is blog specific or not.
+ * @param bool $global Optional. Whether option name is blog specific.
  * @return unknown
  */
 function update_user_option( $user_id, $option_name, $newvalue, $global = false ) {
diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index 375154c181..0085900792 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -952,7 +952,7 @@ class wpdb {
 	 * @since 0.71
 	 * @see wpdb::show_errors()
 	 *
-	 * @return bool Whether showing of errors was active or not
+	 * @return bool Whether showing of errors was active
 	 */
 	function hide_errors() {
 		$show = $this->show_errors;
@@ -1427,7 +1427,7 @@ class wpdb {
 	}
 
 	/**
-	 * Whether or not MySQL database is at least the required minimum version.
+	 * Whether MySQL database is at least the required minimum version.
 	 *
 	 * @since 2.5.0
 	 * @uses $wp_version
@@ -1443,7 +1443,7 @@ class wpdb {
 	}
 
 	/**
-	 * Whether of not the database supports collation.
+	 * Whether the database supports collation.
 	 *
 	 * Called when WordPress is generating the table scheme.
 	 *
diff --git a/wp-trackback.php b/wp-trackback.php
index 6ddef20c32..737fbcecd5 100644
--- a/wp-trackback.php
+++ b/wp-trackback.php
@@ -13,7 +13,7 @@ if (empty($wp)) {
 /**
  * trackback_response() - Respond with error or success XML message
  *
- * @param int|bool $error Whether there was an error or not
+ * @param int|bool $error Whether there was an error
  * @param string $error_message Error message if an error occurred
  */
 function trackback_response($error = 0, $error_message = '') {