Definition -
(1) A list of words with brief explanations of their meanings.
(2) The set of words that a person knows.

Etymology -
The word derives from the Medieval Latin vocabularium, a list of words (from the Latin vocabulum, word or name or noun, which in turn derives from vocare, to name or call).

Oxford English Dictionary -
Its first citation for sense (1) is from 1532:
"Then must he with his translacion make vs an Englishe vocabularye of his own deuise too."
(More Confut. Tindale Wks. 427/1)

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