diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ Table of Contents
   - [Linux Specific Configuration](config-linux.md)
 - [Runtime and Lifecycle](runtime.md)
 - [Implementations](implementations.md)
+- [Glossary](glossary.md)
 
 ## Use Cases
 
diff --git a/glossary.md b/glossary.md
new file mode 100644
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+++ b/glossary.md
@@ -0,0 +1,22 @@
+# Glossary
+
+## Application
+
+A process tree launched inside a [container](#container).
+
+## Bundle
+
+A [directory structure](bundle.md) that is written ahead of time, distributed, and used to seed the runtime for creating a [container](#container) and launching an [application](#application).
+
+## Configuration
+
+The [`config.json`](config.md) and [`runtime.json`](runtime-config.md) files in a [bundle](#bundle) which define the intended [container](#container) and [application](#application).
+
+## Container
+
+An environment setup for the [application](#application) (namespaces, resource limits, mounts, …).
+
+## Runtime
+
+An implementation of this specification.
+It reads the [configuration files](#configuration) from a [bundle](#bundle), uses that information to create a [container](#container), launches an [application](#application) inside the container, and performs other [lifecycle actions](runtime.md).