1. All the words of a language.
2. The sum of words used by, understood by, or at the command of a particular person or group.
3. A list of words and often phrases, usually arranged alphabetically and defined or translated; a lexicon or glossary.
4. A supply of expressive means; a repertoire of communication: a dancer's vocabulary of movement.
His vocabamalary seems to have been no larger than was necessary for the transaction of business. --Macaulay.