diff --git a/entity-command.php b/entity-command.php
index f5a4e47d8..95a35c85e 100644
--- a/entity-command.php
+++ b/entity-command.php
@@ -30,7 +30,7 @@
 WP_CLI::add_command( 'site option', 'Site_Option_Command', array(
 	'before_invoke' => function() {
 		if ( !is_multisite() ) {
-			WP_CLI::error( 'This is not a multisite install.' );
+			WP_CLI::error( 'This is not a multisite installation.' );
 		}
 	}
 ) );
diff --git a/features/site-empty.feature b/features/site-empty.feature
index bc30d40e4..f04fe85c3 100644
--- a/features/site-empty.feature
+++ b/features/site-empty.feature
@@ -1,7 +1,7 @@
 Feature: Empty a WordPress site of its data
 
   Scenario: Empty a site
-    Given a WP install
+    Given a WP installation
     And I run `wp option update uploads_use_yearmonth_folders 0`
     And download:
       | path                        | url                                              |
@@ -13,7 +13,7 @@ Feature: Empty a WordPress site of its data
     When I try `wp site url 1`
     Then STDERR should be:
       """
-      Error: This is not a multisite install.
+      Error: This is not a multisite installation.
       """
     And the return code should be 1
 
@@ -43,7 +43,7 @@ Feature: Empty a WordPress site of its data
     Then STDOUT should be empty
 
   Scenario: Empty a site and its uploads directory
-    Given a WP multisite install
+    Given a WP multisite installation
     And I run `wp site create --slug=foo`
     And I run `wp --url=example.com/foo option update uploads_use_yearmonth_folders 0`
     And download:
diff --git a/features/site-option.feature b/features/site-option.feature
index 98d4088df..de14b84a7 100644
--- a/features/site-option.feature
+++ b/features/site-option.feature
@@ -1,7 +1,7 @@
 Feature: Manage WordPress site options
 
   Scenario: Site Option CRUD
-    Given a WP multisite install
+    Given a WP multisite installation
 
     # String values
     When I run `wp site option add str_opt 'bar'`
@@ -111,24 +111,24 @@ Feature: Manage WordPress site options
       """
 
   Scenario: Error on single install
-    Given a WP install
+    Given a WP installation
 
     When I try `wp site option get str_opt`
     Then STDERR should be:
       """
-      Error: This is not a multisite install.
+      Error: This is not a multisite installation.
       """
     And the return code should be 1
 
     When I try `wp site option add str_opt 'bar'`
     Then STDERR should be:
       """
-      Error: This is not a multisite install.
+      Error: This is not a multisite installation.
       """
     And the return code should be 1
 
   Scenario: Filter options by `--site_id`
-    Given a WP multisite install
+    Given a WP multisite installation
 
     When I run `wp db query "INSERT INTO wp_sitemeta (site_id,meta_key,meta_value) VALUES (2,'wp_cli_test_option','foobar');"`
     Then the return code should be 0
diff --git a/src/Site_Command.php b/src/Site_Command.php
index d2d2aea91..7de0cfc94 100644
--- a/src/Site_Command.php
+++ b/src/Site_Command.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * Creates, deletes, empties, moderates, and lists one or more sites on a multisite install.
+ * Creates, deletes, empties, moderates, and lists one or more sites on a multisite installation.
  *
  * ## EXAMPLES
  *
@@ -223,7 +223,7 @@ public function _empty( $args, $assoc_args ) {
 	}
 
 	/**
-	 * Deletes a site in a multisite install.
+	 * Deletes a site in a multisite installation.
 	 *
 	 * ## OPTIONS
 	 *
@@ -247,7 +247,7 @@ public function _empty( $args, $assoc_args ) {
 	 */
 	function delete( $args, $assoc_args ) {
 		if ( !is_multisite() ) {
-			WP_CLI::error( 'This is not a multisite install.' );
+			WP_CLI::error( 'This is not a multisite installation.' );
 		}
 
 		if ( isset( $assoc_args['slug'] ) ) {
@@ -280,7 +280,7 @@ function delete( $args, $assoc_args ) {
 	}
 
 	/**
-	 * Creates a site in a multisite install.
+	 * Creates a site in a multisite installation.
 	 *
 	 * ## OPTIONS
 	 *
@@ -309,7 +309,7 @@ function delete( $args, $assoc_args ) {
 	 */
 	public function create( $_, $assoc_args ) {
 		if ( !is_multisite() ) {
-			WP_CLI::error( 'This is not a multisite install.' );
+			WP_CLI::error( 'This is not a multisite installation.' );
 		}
 
 		global $wpdb, $current_site;
@@ -431,7 +431,7 @@ private function _get_network( $network_id ) {
 	}
 
 	/**
-	 * Lists all sites in a multisite install.
+	 * Lists all sites in a multisite installation.
 	 *
 	 * ## OPTIONS
 	 *
@@ -496,7 +496,7 @@ private function _get_network( $network_id ) {
 	 */
 	public function list_( $_, $assoc_args ) {
 		if ( !is_multisite() ) {
-			WP_CLI::error( 'This is not a multisite install.' );
+			WP_CLI::error( 'This is not a multisite installation.' );
 		}
 
 		global $wpdb;