1. [n]  a language user's knowledge of words
2. [n]  the system of techniques or symbols serving as a means of expression (as in arts or crafts); "he introduced a wide vocabulary of techniques"
3. [n]  a listing of the words used in some enterprise

Vocabulary
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1. 3. (Mil.) The roll of the drum which calls the troops
      together; as, to beat the general.
   4. (Eccl.) The chief of an order of monks, or of all the
      houses or congregations under the same rule.
   5. The public; the people; the vulgar. [Obs.] --Shak.
   {In general}, in the main; for the most part.
   

2. \Vo*cab"u*la*ry\, 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.
   2. A sum or stock of words employed.
            His vocabulary seems to have been no larger than was
            necessary for the transaction of business.
                                                  --Macaulay.