diff --git a/glossary.yml b/glossary.yml
index 7722d167..fa95b24f 100644
--- a/glossary.yml
+++ b/glossary.yml
@@ -8825,6 +8825,16 @@
     def: >
       A test that exercises one function or feature of a piece of software and
       produces [pass](#pass_test), [fail](#fail_test), or [error](#error_test).
+      
+- slug: unix
+  ref:
+    - operating_system
+  en:
+    term: "UNIX"
+    def: >
+      UNIX is a family of [operating systems](#operating_system) developed during
+      1969 at AT&T Bell Labs. Its main features are simple tools, well-defined functionality
+      and being portable by nature.
 
 
 - slug: unsupervised_learning