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From The Collaborative International Dictionary of English v.0.48:
Vocabulary \Vo*cab"u*la*ry\ (v[-o]*k[a^]b"[-u]*l[asl]*r[y^]), n.; pl. Vocabularies. [LL. vocabularium, vocabularius: cf. F. vocabulaire. See Vocable.] 1. A list or collection of words arranged in alphabetical order and explained; a dictionary or lexicon, either of a whole language, a single work or author, a branch of science, or the like; a word-book. [1913 Webster] Note: The "vocabulary" of this dictionary referred to within the definitions of certain collocations are those words serving as headwords for main entries, and distinguished from word combinations ("collocations") which follow the main part of certain entries. In the XML-tagged version, these headwords are marked by the tags