diff --git a/wp-admin/includes/admin.php b/wp-admin/includes/admin.php
index e6c3edfba..5f5190d8d 100644
--- a/wp-admin/includes/admin.php
+++ b/wp-admin/includes/admin.php
@@ -58,7 +58,7 @@ require_once(ABSPATH . 'wp-admin/includes/update.php');
 /** WordPress Deprecated Administration API */
 require_once(ABSPATH . 'wp-admin/includes/deprecated.php');
 
-/** WordPress Multi-Site support API */
+/** WordPress Multisite support API */
 if ( is_multisite() ) {
 	require_once(ABSPATH . 'wp-admin/includes/ms.php');
 	require_once(ABSPATH . 'wp-admin/includes/ms-deprecated.php');
diff --git a/wp-admin/my-sites.php b/wp-admin/my-sites.php
index 6f4396b72..8411387a6 100644
--- a/wp-admin/my-sites.php
+++ b/wp-admin/my-sites.php
@@ -37,7 +37,7 @@ $parent_file = 'index.php';
 
 add_contextual_help($current_screen,
 	'<p>' . __('This screen shows an individual user all of their sites in this network, and also allows that user to set a primary site. He or she can use the links under each site to visit either the frontend or the dashboard for that site.') . '</p>' .
-	'<p>' . __('Up until WordPress version 3.0, what is now called a Multi-site Network had to be installed separately as WordPress MU (multi-user).') . '</p>'
+	'<p>' . __('Up until WordPress version 3.0, what is now called a Multisite Network had to be installed separately as WordPress MU (multi-user).') . '</p>'
 );
 
 get_current_screen()->set_help_sidebar(
diff --git a/wp-admin/themes.php b/wp-admin/themes.php
index 0fac69fd5..13a440530 100644
--- a/wp-admin/themes.php
+++ b/wp-admin/themes.php
@@ -48,7 +48,7 @@ get_current_screen()->add_help_tab( array(
 
 if ( current_user_can( 'install_themes' ) ) {
 	if ( is_multisite() ) {
-		$help_install = '<p>' . __('Installing themes on MultiSite can only be done from the Network Admin section.') . '</p>';
+		$help_install = '<p>' . __('Installing themes on Multisite can only be done from the Network Admin section.') . '</p>';
 	} else {
 		$help_install = '<p>' . sprintf( __('If you would like to see more themes to choose from, click on the &#8220;Install Themes&#8221; tab and you will be able to browse or search for additional themes from the <a href="%s" target="_blank">WordPress.org Theme Directory</a>. Themes in the WordPress.org Theme Directory are designed and developed by third parties, and are compatible with the license WordPress uses. Oh, and they&#8217;re free!'), 'http://wordpress.org/extend/themes/' ) . '</p>';
 	}
diff --git a/wp-includes/ms-functions.php b/wp-includes/ms-functions.php
index 1c7c69193..17e0e670b 100644
--- a/wp-includes/ms-functions.php
+++ b/wp-includes/ms-functions.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * Multi-site WordPress API
+ * Multisite WordPress API
  *
  * @package WordPress
  * @subpackage Multisite