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A glossary and a dictionary both explain the meaning of words, but their use and scope are different.
This is a short reference for cases where you are unsure which one to create in documentation or project management.
Comparison Table
| Item | Dictionary | Glossary |
|---|---|---|
| Scope | Entire language (general) | Specific document, project, or domain (limited) |
| Main purpose | Learn the general meaning, pronunciation, and origin of a word | Define what a term means in a specific document or context |
| Included words | General vocabulary | Technical terms, abbreviations, and local coinages |
| Author | Lexicographers and dictionary editors | Authors and project members |
| Examples | Oxford English Dictionary, Kojien | Definition clauses in contracts, glossary sections at the end of technical books |
Characteristics of a Glossary
Context-dependent
Unlike a general dictionary definition, a glossary is used to define local rules such as, “In this project, ‘User’ means a paying member only and does not include free users.”
Where it appears
You often see it at the end of a book, at the beginning of a technical specification, or in Article 1 of a contract as the definition section.
Origin
It comes from the Greek glōssa (tongue, language), and originally referred to annotations written in the margins of books to explain difficult words.
Characteristics of a Dictionary
Universal
It explains the original meaning of a word regardless of context, along with things such as part of speech and pronunciation.
Where it appears
It exists as a standalone book or online service.
Origin
It comes from the Latin dictio (speaking, word).
Summary
A glossary defines the terms used in a specific project or document. A dictionary is a general-purpose reference covering the language as a whole.
When writing documentation, preparing a glossary makes it easier for readers to understand terms in a consistent way.