Vocabulary is the all the language and words either used or understood by a person or group of people.
(noun)See vocabulary in Webster's New World College Dictionary
noun pl. vocabularies
Origin: ML vocabularium < L vocabulum, a word: see vocable
See vocabulary in American Heritage Dictionary 4
noun pl. vo·cab·u·lar·ies
Origin:
Origin: French vocabulaire
Origin: , from Old French
Origin: , from Medieval Latin vocābulārium
Origin: , from neuter of vocābulārius, of words
Origin: , from Latin vocābulum, name; see vocable
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