diff --git a/aio/content/guide/glossary.md b/aio/content/guide/glossary.md
index cb5faa7bc7..37aa102426 100644
--- a/aio/content/guide/glossary.md
+++ b/aio/content/guide/glossary.md
@@ -303,6 +303,14 @@ Learn more in [Dependency Injection in Angular](guide/dependency-injection).
 
 A lookup token associated with a dependency [provider](#provider), for use with the [dependency injection](#di) system.
 
+{@a differential-loading}
+
+## differential loading
+
+A build technique that creates two bundles for an application. One smaller bundle is for modern browsers. A second, larger bundle allows the application to run correctly in older browsers (such as IE11) that do not support all modern browser APIs.
+
+For more information, see the [Deployment](guide/deployment#differential-loading) guide.
+
 
 {@a directive}
 {@a directives}