Etymology
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vocabulary (n.)

1530s, "list of words with explanations," from Medieval Latin vocabularium "a list of words," from Latin vocabulum "word, name, noun," from vocare "to name, call," which is related to vox (genitive vocis) "voice" (from PIE root *wekw- "to speak"). The meaning "range of words in the language of a person or group" is attested from 1753.

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Definitions of vocabulary

vocabulary (n.)
a listing of the words used in some enterprise;
vocabulary (n.)
a language user's knowledge of words;
Synonyms: lexicon / mental lexicon
vocabulary (n.)
the system of techniques or symbols serving as a means of expression (as in arts or crafts);
he introduced a wide vocabulary of techniques
From wordnet.princeton.edu