diff --git a/pages/learn/glossary.md b/pages/learn/glossary.md
index 66b4a3abc..decf97dbf 100644
--- a/pages/learn/glossary.md
+++ b/pages/learn/glossary.md
@@ -53,6 +53,10 @@ A property appearing within a [schema](#schema) object.
 
 The [JSON Schema specification](../specification) defines behavior for a large library of keywords which can be used to describe [instances](#instance).
 
+### implementation
+
+Historically, the word "implementation" has been used to describe both specifically validators/annotators (the scope of the spec) and also various other kinds of JSON Schema tooling.  However, due to this ambiguity, we have decided that the preferred conversational term should be ["tooling"](#tooling).
+
 ### instance
 
 A piece of JSON data which is to be described by a [schema](#schema).
@@ -112,6 +116,19 @@ Said more plainly, whether a particular value is a subschema or not depends on i
 
 Subschemas may themselves contain sub-subschemas, though colloquially one generally uses the term "subschema" regardless of the level of nesting, further clarifying which larger schema is the parent schema whenever needed.
 
+### tooling
+
+A JSON Schema tool (or colloquially "tooling") is any software application or library for working with or evaluating schemas in some way.
+
+The following are considered tools:
+
+- a validator library
+- a CLI validator
+- a schema or code generator
+- a UI form generator
+
+Applications which use JSON Schema internally without exposing that functionality in some way, for example, validating configuration files or web requests, are not considered tooling.
+
 ### vocabulary
 
 A tightly related collection of [keywords](#keyword), grouped to facilitate re-use.