ac·cu·mu·la·tive /əˈkjum(j)əˌletɪv, lə-/
  (a.)積聚的,累積的
  Ac·cu·mu·la·tive a. Characterized by accumulation; serving to collect or amass; cumulative; additional.  -- Ac*cu*mu*la*tive*ly, adv. -- Ac*cu*mu*la*tive*ness, n.
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  accumulative
       adj 1: increasing by successive addition; "the benefits are
              cumulative"; "the eventual accumulative effect of
              these substances" [syn: cumulative]
       2: marked by acquiring or amassing; "we live in an accumulative
          society"