diff --git a/doc/glossary/glossary-terms.xml b/doc/glossary/glossary-terms.xml
index e737be54b4..65c72f12b2 100644
--- a/doc/glossary/glossary-terms.xml
+++ b/doc/glossary/glossary-terms.xml
@@ -3658,6 +3658,14 @@ daemon that provides
                     cloud.</para>
             </glossdef>
         </glossentry>
+        <glossentry>
+            <glossterm>region</glossterm>
+            <glossdef>
+                <para>A Discrete OpenStack environment with dedicated API
+                      endpoints that typically shares only the Identity
+                      Service (keystone) with other regions.</para>
+            </glossdef>
+        </glossentry>
         <glossentry>
             <glossterm>registry</glossterm>
             <glossdef>