diff --git a/core/lib/Drupal/Core/Config/ConfigImporter.php b/core/lib/Drupal/Core/Config/ConfigImporter.php
index 007282e..715138f 100644
--- a/core/lib/Drupal/Core/Config/ConfigImporter.php
+++ b/core/lib/Drupal/Core/Config/ConfigImporter.php
@@ -560,7 +560,7 @@ protected function processExtensions(array &$context) {
     $operation = $this->getNextExtensionOperation();
     if (!empty($operation)) {
       $this->processExtension($operation['type'], $operation['op'], $operation['name']);
-      $context['message'] = t('Synchronising extensions: @op @name.', array('@op' => $operation['op'], '@name' => $operation['name']));
+      $context['message'] = t('Synchronizing extensions: @op @name.', array('@op' => $operation['op'], '@name' => $operation['name']));
       $processed_count = count($this->processedExtensions['module']['install']) + count($this->processedExtensions['module']['uninstall']);
       $processed_count += count($this->processedExtensions['theme']['uninstall']) + count($this->processedExtensions['theme']['install']);
       $context['finished'] = $processed_count / $this->totalExtensionsToProcess;
@@ -857,8 +857,8 @@ protected function checkOp($collection, $op, $name) {
       case 'update':
         if (!$target_exists) {
           $this->logError($this->t('Update target "@name" is missing.', array('@name' => $name)));
-          // Mark as processed so that the synchronisation continues. Once the
-          // the current synchronisation is complete it will show up as a
+          // Mark as processed so that the synchronization continues. Once the
+          // the current synchronization is complete it will show up as a
           // create.
           $this->setProcessedConfiguration($collection, $op, $name);
           return FALSE;
diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
index 627bb83..ad5f0d1 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
@@ -304,7 +304,7 @@ public function preSave(EntityStorageInterface $storage) {
     }
     if (!$this->isSyncing()) {
       // Ensure the correct dependencies are present. If the configuration is
-      // being written during a configuration synchronisation then there is no
+      // being written during a configuration synchronization then there is no
       // need to recalculate the dependencies.
       $this->calculateDependencies();
     }
diff --git a/core/lib/Drupal/Core/Config/StorageComparer.php b/core/lib/Drupal/Core/Config/StorageComparer.php
index b720abb..e3e42d8 100644
--- a/core/lib/Drupal/Core/Config/StorageComparer.php
+++ b/core/lib/Drupal/Core/Config/StorageComparer.php
@@ -262,7 +262,7 @@ protected function addChangelistUpdate($collection) {
         if (isset($this->sourceData[$collection][$name]['uuid']) && $this->sourceData[$collection][$name]['uuid'] != $this->targetData[$collection][$name]['uuid']) {
           // The entity has the same file as an existing entity but the UUIDs do
           // not match. This means that the entity has been recreated so config
-          // synchronisation should do the same.
+          // synchronization should do the same.
           $recreates[] = $name;
         }
         else {
diff --git a/core/lib/Drupal/Core/Extension/ModuleInstaller.php b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
index 20a6506..c77dd34 100644
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -216,7 +216,7 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
             ->setSourceStorage($source_storage);
         }
         else {
-          // If we're not in a config synchronisation reset the source storage
+          // If we're not in a config synchronization reset the source storage
           // so that the extension install storage will pick up the new
           // configuration.
           $config_installer->resetSourceStorage();
diff --git a/core/modules/config/src/Form/ConfigSync.php b/core/modules/config/src/Form/ConfigSync.php
index dd271a3..fd0166b 100644
--- a/core/modules/config/src/Form/ConfigSync.php
+++ b/core/modules/config/src/Form/ConfigSync.php
@@ -353,7 +353,7 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
    * @param \Drupal\Core\Config\ConfigImporter $config_importer
    *   The batch config importer object to persist.
    * @param string $sync_step
-   *   The synchronisation step to do.
+   *   The synchronization step to do.
    * @param $context
    *   The batch context.
    */
diff --git a/core/modules/config/src/Tests/AssertConfigEntityImportTrait.php b/core/modules/config/src/Tests/AssertConfigEntityImportTrait.php
index 0f8ad2b..6d9b298 100644
--- a/core/modules/config/src/Tests/AssertConfigEntityImportTrait.php
+++ b/core/modules/config/src/Tests/AssertConfigEntityImportTrait.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * Provides test assertions for testing config entity synchronisation.
+ * Provides test assertions for testing config entity synchronization.
  *
  * Can be used by test classes that extend \Drupal\simpletest\WebTestBase or
  * \Drupal\simpletest\KernelTestBase.
diff --git a/core/modules/language/src/Tests/LanguageConfigOverrideImportTest.php b/core/modules/language/src/Tests/LanguageConfigOverrideImportTest.php
index a39899d..cedfb96 100644
--- a/core/modules/language/src/Tests/LanguageConfigOverrideImportTest.php
+++ b/core/modules/language/src/Tests/LanguageConfigOverrideImportTest.php
@@ -35,7 +35,7 @@ public function testConfigOverrideImport() {
 
     // Uninstall the language module and its dependencies so we can test
     // enabling the language module and creating overrides at the same time
-    // during a configuration synchronisation.
+    // during a configuration synchronization.
     \Drupal::service('module_installer')->uninstall(array('language'));
     // Ensure that the current site has no overrides registered to the
     // ConfigFactory.
diff --git a/core/modules/node/src/Tests/NodeTypeRenameConfigImportTest.php b/core/modules/node/src/Tests/NodeTypeRenameConfigImportTest.php
index 5497ee8..63b1ce6 100644
--- a/core/modules/node/src/Tests/NodeTypeRenameConfigImportTest.php
+++ b/core/modules/node/src/Tests/NodeTypeRenameConfigImportTest.php
@@ -13,7 +13,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Tests importing renamed node type via configuration synchronisation.
+ * Tests importing renamed node type via configuration synchronization.
  *
  * @group node
  */