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Definition

noun, plural: vocabularies

(1) The words of a language used for self-expression or communication.

(2) A list of words (or phrases) with their meanings or translations, usually arranged alphabetically.

(3) A set of signs or symbols that are used for nonverbal communication, as in ‘vocabulary of a computer’

Supplement

Word origin: from French vocabulaire, from Old French, from Medieval Latin vocābulārium, from neuter of vocābulārius, of words, from Latin vocābulum.
Synonym: lexicon, dictionary.
See also: language.