vocabulary vocabulary /voʊˈkæbjəˌlɛri/

noun

1. () A listing of the words used in some enterprise  ( vocab [Informal] , vocabulary )
   a listing of the words used in some enterprise
     He expanded his vocabulary by learning new words every day.
   He expanded his vocabulary by learning new words every day.
   
2. () A language user's knowledge of words  ( mental lexicon , vocab [Informal] , lexicon , vocabulary )
   a language user's knowledge of words
   
3. () (art) the system of techniques or symbols serving as a means of expression (as in arts or crafts)  ( vocabulary )
   (art) the system of techniques or symbols serving as a means of expression (as in arts or crafts)
    He introduced a wide vocabulary of techniques
   he introduced a wide vocabulary of techniques