Etymology
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glossary (n.)

"collected explanations of words (especially those not in ordinary use), a book of glosses," mid-14c., from Latin glossarium "collection of glosses," from Greek glossarion, diminutive of glōssa "obsolete or foreign word" (see gloss (n.2)). Related: Glossarial.

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Definitions of glossary

glossary (n.)
an alphabetical list of technical terms in some specialized field of knowledge; usually published as an appendix to a text on that field;
Synonyms: gloss
From wordnet.princeton.edu