diff --git a/files/en-us/_redirects.txt b/files/en-us/_redirects.txt
index 65e6d096673a6f0..5c806cb21a2f9c7 100644
--- a/files/en-us/_redirects.txt
+++ b/files/en-us/_redirects.txt
@@ -3601,6 +3601,7 @@
 /en-US/docs/Glossary/Property_(CSS)	/en-US/docs/Glossary/property/CSS
 /en-US/docs/Glossary/Random_Number_Generator	/en-US/docs/Glossary/RNG
 /en-US/docs/Glossary/Reference	/en-US/docs/Glossary/Object_reference
+/en-US/docs/Glossary/Rendering_engine	/en-US/docs/Glossary/Engine/Rendering
 /en-US/docs/Glossary/Responsive_design	/en-US/docs/Glossary/Responsive_web_design
 /en-US/docs/Glossary/Round_Trip_Time_(RTT)	/en-US/docs/Glossary/Round_Trip_Time
 /en-US/docs/Glossary/SRTP	/en-US/docs/Glossary/RTP
diff --git a/files/en-us/_wikihistory.json b/files/en-us/_wikihistory.json
index 1160b3187a32599..e1db6503ac4bdb4 100644
--- a/files/en-us/_wikihistory.json
+++ b/files/en-us/_wikihistory.json
@@ -2159,7 +2159,7 @@
       "fscholz"
     ]
   },
-  "Glossary/Engine": {
+  "Glossary/Engine/JavaScript": {
     "modified": "2019-05-09T03:04:25.699Z",
     "contributors": [
       "SphinxKnight",
@@ -2172,6 +2172,18 @@
       "panaggio"
     ]
   },
+  "Glossary/Engine/Rendering": {
+    "modified": "2020-09-28T13:38:28.076Z",
+    "contributors": [
+      "myakura",
+      "ramsunvtech",
+      "hbloomer",
+      "Andrew_Pfeiffer",
+      "klez",
+      "kscarfone",
+      "ChrisL"
+    ]
+  },
   "Glossary/Entity": {
     "modified": "2019-09-05T01:20:53.488Z",
     "contributors": [
@@ -4213,18 +4225,6 @@
       "teainthegarden"
     ]
   },
-  "Glossary/Rendering_engine": {
-    "modified": "2020-09-28T13:38:28.076Z",
-    "contributors": [
-      "myakura",
-      "ramsunvtech",
-      "hbloomer",
-      "Andrew_Pfeiffer",
-      "klez",
-      "kscarfone",
-      "ChrisL"
-    ]
-  },
   "Glossary/Repo": {
     "modified": "2019-03-23T23:09:46.809Z",
     "contributors": [
diff --git a/files/en-us/glossary/engine/index.md b/files/en-us/glossary/engine/index.md
index ef8c9c8bf9b26c0..c7ee512abf95950 100644
--- a/files/en-us/glossary/engine/index.md
+++ b/files/en-us/glossary/engine/index.md
@@ -6,8 +6,6 @@ page-type: glossary-definition
 
 {{GlossarySidebar}}
 
-The {{glossary("JavaScript")}} engine is an interpreter that parses and executes a JavaScript program.
+The term **engine** can have several meanings depending on the context. It may refer to:
 
-## See also
-
-- [JavaScript engine](https://en.wikipedia.org/wiki/JavaScript_engine) on Wikipedia
+{{GlossaryDisambiguation}}
diff --git a/files/en-us/glossary/engine/javascript/index.md b/files/en-us/glossary/engine/javascript/index.md
new file mode 100644
index 000000000000000..086fec7c618fda3
--- /dev/null
+++ b/files/en-us/glossary/engine/javascript/index.md
@@ -0,0 +1,23 @@
+---
+title: JavaScript engine
+slug: Glossary/Engine/JavaScript
+page-type: glossary-definition
+---
+
+{{GlossarySidebar}}
+
+**JavaScript engines** are interpreters that parse and execute {{glossary("JavaScript")}} code. Modern JavaScript engines use just-in-time (JIT) compilation to convert JavaScript code into machine code that can be executed by a computer's processor. A JavaScript engine is typically developed and used in web {{glossary("browser", "browsers")}} to run client-side code but can also be used in server-side environments like {{glossary("Node.js")}}.
+
+In a browser, the JavaScript engine operates together with the rendering engine via the {{glossary("DOM", "Document Object Model")}} and {{glossary("WebIDL", "Web IDL")}} bindings. Some JavaScript engines also execute {{glossary("WebAssembly")}} code in the same sandbox as regular JavaScript code.
+
+Do not confuse JavaScript engines with {{glossary("engine/rendering", "rendering engines")}}, which are also crucial parts of browsers.
+
+## See also
+
+- [JavaScript engine](https://en.wikipedia.org/wiki/JavaScript_engine) on Wikipedia
+- Glossary
+  - {{glossary("Engine")}}
+  - {{glossary("JavaScript")}}
+  - {{glossary("WebAssembly")}}
+  - {{glossary("Browser")}}
+  - {{glossary("Node.js")}}
diff --git a/files/en-us/glossary/engine/rendering/index.md b/files/en-us/glossary/engine/rendering/index.md
new file mode 100644
index 000000000000000..d41e56ff27aee21
--- /dev/null
+++ b/files/en-us/glossary/engine/rendering/index.md
@@ -0,0 +1,23 @@
+---
+title: Rendering engine
+slug: Glossary/Engine/Rendering
+page-type: glossary-definition
+---
+
+{{GlossarySidebar}}
+
+**Rendering engines** (also known as layout engines or browser engines) are part of a {{glossary("Browser", "web browser")}} that transforms {{glossary("HTML")}}, {{glossary("CSS")}}, and other resources of a web page into a visual representation on a screen.
+
+Common rendering engines include:
+
+- {{glossary("Blink")}}
+- {{glossary("Gecko")}}
+- {{glossary("WebKit")}}
+- {{glossary("Trident")}}
+
+## See also
+
+- [Browser engine](https://en.wikipedia.org/wiki/Browser_engine) on Wikipedia
+- Glossary
+  - {{Glossary("Engine")}}
+  - {{Glossary("Browser")}}
diff --git a/files/en-us/glossary/rendering_engine/index.md b/files/en-us/glossary/rendering_engine/index.md
deleted file mode 100644
index 778bf5b38e8a914..000000000000000
--- a/files/en-us/glossary/rendering_engine/index.md
+++ /dev/null
@@ -1,14 +0,0 @@
----
-title: Rendering engine
-slug: Glossary/Rendering_engine
-page-type: glossary-definition
----
-
-{{GlossarySidebar}}
-
-A **rendering engine** is software that draws text and images on the screen. The engine draws structured text from a document (often {{glossary("HTML")}}), and formats it properly based on the given style declarations (often given in {{glossary("CSS")}}). Examples of layout engines: {{glossary("Blink")}}, {{glossary("Gecko")}}, EdgeHTML, {{glossary("WebKit")}}.
-
-## See also
-
-- [Web browser engine](https://en.wikipedia.org/wiki/Web_browser_engine) on Wikipedia
-- [Venkatraman.R - Behind Browsers (Part 1, Basics)](https://medium.com/@ramsunvtech/behind-browser-basics-part-1-b733e9f3c0e6)