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A per­son­’s vocab­u­lary is the set of words with­in a lan­guage that are famil­iar to that per­son. A vocab­u­lary usu­al­ly devel­ops with age, and serves as a use­ful and fun­da­men­tal tool for com­mu­ni­ca­tion and acquir­ing knowl­edge. Acquir­ing an exten­sive vocab­u­lary is one of the largest chal­lenges in learn­ing a sec­ond language.