diff --git a/mkdocs.yml b/mkdocs.yml
index 6d12ada..026bf7d 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -43,6 +43,8 @@ nav:
   - Guides:
     - Index: guides/index.md
     - Implementation Guidelines: guides/guidelines.md
+  - Glossary:
+    - Index: references/glossary/index.md
   - Reference:
     - Namespace Sameness: concepts/namespace-sameness.md
     - ClusterSet: api-types/cluster-set.md
diff --git a/site-src/references/glossary/index.md b/site-src/references/glossary/index.md
new file mode 100644
index 0000000..7508258
--- /dev/null
+++ b/site-src/references/glossary/index.md
@@ -0,0 +1,24 @@
+# Glossary
+
+About API: A cluster-local CRD to store arbitrary properties about a cluster.
+See [About API Overview](concepts/about-api.md).
+
+ClusterProfile API: A CRD intended to store information about member clusters in
+a clusterset. See [ClusterProfile API Overview](concepts/clusterprofile-api.md).
+
+ClusterSet: A group of clusters governed by a single authority, with a high
+degree of trust, and in which namespace sameness applies. See [ClusterSet
+reference](api-types/clusterset.md).
+
+Multicluster Services API: An CRD composed of the ServiceExport and
+ServiceImport Kinds, used to facilitate accessing Services across clusters. See
+[Multicluster Services API Overview](concepts/multicluster-services-api.md).
+
+Namespace Sameness: A property of clusters in clustersets, in which Kubernetes
+objects of the same name in the same namespace are expected to behave similarly
+across the clusterset. See [Namespace Sameness
+reference](api-types/namespace-sameness.md).
+
+Work API: A CRD defining the Work Kind, intended to facilitate distributing
+workloads across multiple clusters. See [Work API
+Overview](concepts/work-api.md).