the stock of words used by or known to a particular people or group of persons: His French vocabulary is rather limited. The scientific vocabulary is constantly growing.
2.
a list or collection of the words or phrases of a language, technical field, etc., usually arranged in alphabetical order and defined: Study the vocabulary in the fourth chapter.
3.
the words of a language.
4.
any collection of signs or symbols constituting a means or system of nonverbal communication: vocabulary of a computer.
5.
any more or less specific group of forms characteristic of an artist, a style of art, architecture, or the like.
Origin: 1525–35; < ML vocābulārium, n. use of neut. of vocābulārius of words, equiv. to L vocābul(um) vocable+ -ārius-ary
vo·cab·u·lar·y (vō-kāb'yə-lěr'ē) n.
pl.vo·cab·u·lar·ies
All the words of a language.
The sum of words used by, understood by, or at the command of a particular person or group.
A list of words and often phrases, usually arranged alphabetically and defined or translated; a lexicon or glossary.
A supply of expressive means; a repertoire of communication: a dancer's vocabulary of movement.
[French vocabulaire, from Old French, from Medieval Latin vocābulārium, from neuter of vocābulārius, of words, from Latin vocābulum, name; see vocable.]
[voh-kab-yuh-ler-ee] 
yəˌlɛr