diff --git a/docs/reference/glossary.asciidoc b/docs/reference/glossary.asciidoc
index d4c3c9d9028..d92ed10c766 100644
--- a/docs/reference/glossary.asciidoc
+++ b/docs/reference/glossary.asciidoc
@@ -38,6 +38,19 @@ local cluster. For more information, see
 The {ccs} feature enables any node to act as a federated client across
 multiple clusters. See <<modules-cross-cluster-search>>.    
 
+[[glossary-data-stream]] data stream ::
++
+--
+// tag::data-stream-def[]
+A named resource used to ingest, search, and manage time-series data in {es}. A
+data stream's data is stored across multiple hidden, auto-generated
+<<glossary-index,indices>>. You can automate management of these indices to more
+efficiently store large data volumes.
+
+See {ref}/data-streams.html[Data streams].
+// end::data-stream-def[]
+--
+
 [[glossary-document]] document ::
 
 A document is a JSON document which is stored in Elasticsearch. It is