diff --git a/aio/content/guide/glossary.md b/aio/content/guide/glossary.md
index 27d8d8049f..0046d4ac2b 100644
--- a/aio/content/guide/glossary.md
+++ b/aio/content/guide/glossary.md
@@ -627,6 +627,11 @@ The [npm package manager](https://docs.npmjs.com/getting-started/what-is-npm) is
 
 Learn more about how Angular uses [Npm Packages](guide/npm-packages).
 
+{@ ngc}
+## ngc
+`ngc` is a Typescript-to-Javascript transpiler that processes Angular decorators, metadata, and templates, and emits JavaScript code.
+The most recent implementation is internally refered to as `ngtsc` because it's a minimalistic wrapper around the TypeScript compiler `tsc` that adds a transform for processing Angular code.
+
 {@a O}
 
 {@a observable}