Start a glossary of terms

docs/source/glossary.rst

@@ -0,0 +1,29 @@
+.. _glossary:
+
+================================================
+ Glossary of Terms Used in Flake8 Documentation
+================================================
+
+.. glossary::
+    :sorted:
+
+    formatter
+        A :term:`plugin` that augments the output of |Flake8| when passed
+        to :option:`flake8 --format`.
+
+    plugin
+        A package that is typically installed from PyPI to augment the
+        behaviour of |Flake8| either through adding one or more additional
+        :term:`check`\ s or providing additional :term:`formatter`\ s.
+
+    check
+        A piece of logic that corresponds to an error code. A check may
+        be a style check (e.g., check the length of a given line against
+        the user configured maximum) or a lint check (e.g., checking for
+        unused imports) or some other check as defined by a plugin.
+
+    error code
+        The symbol associated with a specific :term:`check`. For example,
+        pycodestyle implements :term:`check`\ s that look for whitespace
+        around binary operators and will either return an error code of
+        W503 or W504.

docs/source/index.rst

@@ -69,13 +69,14 @@ Alternatively, if you want to *ignore* only one specific warning or error:
 Please read our user guide for more information about how to use and configure
 |Flake8|.
 
-FAQ
-===
+FAQ and Glossary
+================
 
 .. toctree::
     :maxdepth: 2
 
     faq
+    glossary
 
 User Guide
 ==========
@@ -127,3 +128,4 @@ General Indices
 
 * :ref:`genindex`
 * :ref:`Index of Documented Public Modules <modindex>`
+* :ref:`Glossary of terms <glossary>`