Webster's English Dictionary

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vocabulary

vo.cab.u.lary \vo--'kab-y*-.ler-e-, v*-\ n [MF vocabulaire, prob. fr. ML 
   vocabularium, fr. neut. of vocabul]arius verbal, fr. L vocabulum 1: a list 
   or collection of words or of words and phrases usu. alphabeticall y 
   arranged and explained or defined : LEXICON 2: a sum or stock of words 
   employed by a language, group, individual, or wo rk or in a field of 
   knowledge