glossary (from Ancient Greek: γλῶσσα, glossa; language, speech, wording) also known as a vocabulary or clavis, is an alphabetical list of terms in a particular domain of knowledge with the definitions for those terms. Traditionally, a glossary appears at the end of a book and includes terms within that book that are either newly introduced, uncommon, or specialized. While glossaries are most commonly associated with non-fiction books, in some cases, fiction novels may come with a glossary for unfamiliar terms.

A bilingual glossary is a list of terms in one language defined in a second language or glossed by synonyms (or at least near-synonyms) in another language.

A glossary can be defined again as an alphabetical list, with meanings, of the words or phrases in a text that are difficult to understand or an alphabetical list of difficulttechnical, or foreign words in a text along with explanations of their meanings