diff --git a/MANIFEST.md b/MANIFEST.md
index cdc4363..ee6220e 100644
--- a/MANIFEST.md
+++ b/MANIFEST.md
@@ -51,6 +51,7 @@ admits future files.
 - `explainers/what-is-architecture-as-code/index.html`
 - `explainers/what-is-architecture-as-code/what-is-architecture-as-code.pdf`
 - `favicon.ico`
+- `glossary/index.html`
 - `index.html`
 - `install/go/claude/index.html`
 - `install/go/jetbrains/index.html`
diff --git a/glossary/index.html b/glossary/index.html
new file mode 100644
index 0000000..9b9cff4
--- /dev/null
+++ b/glossary/index.html
@@ -0,0 +1,145 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Transitrix Glossary | Transitrix</title>
+  <meta name="description" content="Definitions for Architecture-as-Code, Element, Atomicity, and Canon from the Transitrix Methodology.">
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+  <meta property="og:description" content="Definitions for Architecture-as-Code, Element, Atomicity, and Canon from the Transitrix Methodology.">
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+      "@id": "https://transitrix.com/glossary/#architecture-as-code",
+      "name": "Architecture-as-Code (AaC)",
+      "description": "Approach to defining and managing architecture through version-controlled text files rather than a GUI-only modelling tool.",
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+        "@id": "https://transitrix.com/glossary/#glossary"
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+      "description": "The validated, authoritative model — the zone everything else is admitted into.",
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+          <li><a href="/library/">Library</a></li>
+          <li><a href="/install/">Install &amp; start</a></li>
+        </ul>
+      </nav>
+    </div>
+  </header>
+  <main id="main" class="wrap" tabindex="-1">
+    <div class="hero">
+      <h1 id="glossary">Transitrix Glossary</h1>
+      <p class="lede">Four terms from the <a href="https://github.com/transitrix/methodology/blob/27cc5c302c9dfb9f66d184c003007f5527b1010e/method/00-glossary.md">Transitrix Methodology v8.0.0 glossary</a>.</p>
+    </div>
+
+    <section aria-labelledby="architecture-as-code">
+      <h2 id="architecture-as-code">Architecture-as-Code (AaC)</h2>
+      <p>Approach to defining and managing architecture through version-controlled text files rather than a GUI-only modelling tool.</p>
+    </section>
+
+    <section aria-labelledby="element">
+      <h2 id="element">Element</h2>
+      <p>An architectural primitive — the atomic unit of modelling (a goal, a role, a process, an application component). One element = one file.</p>
+    </section>
+
+    <section aria-labelledby="atomicity">
+      <h2 id="atomicity">Atomicity</h2>
+      <p>Principle by which an element&#x27;s description and its relations are stored in separate files — an element file never inlines a first-class relation.</p>
+    </section>
+
+    <section aria-labelledby="canon">
+      <h2 id="canon">Canon</h2>
+      <p>The validated, authoritative model — the zone everything else is admitted into.</p>
+    </section>
+  </main>
+  <footer class="site-footer">
+    <div class="wrap">
+      <div class="footer-inner">
+        <p>
+          <a href="https://github.com/transitrix">github.com/transitrix</a> ·
+          <a href="https://x.com/transitrix">@transitrix</a>
+        </p>
+      </div>
+      <p class="footer-attribution">Created and maintained by Valerii Korobeinikov — enterprise-architecture advisory at <a href="https://korobeinikov.consulting">korobeinikov.consulting</a></p>
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diff --git a/semantic-standards/index.html b/semantic-standards/index.html
index 5f984e7..cda95fa 100644
--- a/semantic-standards/index.html
+++ b/semantic-standards/index.html
@@ -59,6 +59,8 @@ <h1>Semantic Standards and Interoperability</h1>
       <p class="lede">Keep the meaning when a model crosses a boundary: identity, context, mapping limits and evidence matter as much as the format.</p>
     </div>
 
+    <p>For definitions of core modelling terms, see the <a href="/glossary/">Transitrix Glossary</a>.</p>
+
     <section aria-labelledby="foundations-heading">
       <h2 id="foundations-heading">A foundation, with explicit differences</h2>
       <p>Transitrix uses plain-text models under Git. ArchiMate 3.2 is a starting foundation, alongside BPMN for process modelling. Transitrix also makes deliberate choices about identity, time, stakeholder interests and evidence. Better model representation takes precedence over strict fidelity.</p>
diff --git a/sitemap.xml b/sitemap.xml
index 8c22397..02d4cb0 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -45,6 +45,10 @@
     <loc>https://transitrix.com/explainers/what-is-architecture-as-code/</loc>
     <xhtml:link rel="alternate" hreflang="en" href="https://transitrix.com/explainers/what-is-architecture-as-code/"/>
   </url>
+  <url>
+    <loc>https://transitrix.com/glossary/</loc>
+    <xhtml:link rel="alternate" hreflang="en" href="https://transitrix.com/glossary/"/>
+  </url>
   <url>
     <loc>https://transitrix.com/install/</loc>
     <xhtml:link rel="alternate" hreflang="en" href="https://transitrix.com/install/"/>