ep·och·al /ˈɛpəkəl, ˈɛˌpɑkəl/
  (a.)新紀元的,劃時代的
  Ep·o·chal a. Belonging to an epoch; of the nature of an epoch. “Epochal points.”
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  epochal
       adj : highly significant or important especially bringing about or
             marking the beginning of a new development or era;
             "epochal decisions made by Roosevelt and Churchill";
             "an epoch-making discovery" [syn: epoch-making]