a list of terms in a special subject, field, or area of usage, with accompanying definitions.
2.
such a list at the back of a book, explaining or defining difficult or unusual words and expressions used in the text.
Origin: 1350–1400;Middle Englishglossarye < Latinglōssarium difficult word requiring explanation < Greekglōssárion, diminutive of glôssa tongue, language; later taken as a collection of such words, by construing suffix as Latin-ārium-ary; cf. gloss2