The Collaborative International Dictionary of English v.0.48:

Glossary \Glos"sa*ry\, n.; pl. Gossaries. [L. glossarium, fr.
   glossa: cf. F. glossaire. See 3d Gloss.]
   A collection of glosses or explanations of words and passages
   of a work or author; a partial dictionary of a work, an
   author, a dialect, art, or science, explaining archaic,
   technical, or other uncommon words.
   [1913 Webster]

WordNet (r) 3.0 (2006):

glossary
    n 1: an alphabetical list of technical terms in some specialized
         field of knowledge; usually published as an appendix to a
         text on that field [syn: glossary, gloss]