Accumulative a. : Characterized by accumulation; serving to collect or amass; cumulative; additional.

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Defination from the web:
accumulative from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 1 : cumulative <an age of rapid and accumulative change> 2 : tending or given to accumulation. — ac·cu·mu·la·tive·ly adverb. — ac·cu·mu·la ...