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  1. Oxford Dictionary

    orthogenesis

    • IPA[ˌɔːθə(ʊ)ˈdʒɛnɪsɪs]

    英式

    • n.
      evolution in which variations follow a particular direction and are not merely sporadic and fortuitous.

    • noun: orthogenesis

    • 更多解釋

    orthogenesis

    • IPA[ˌôrTHōˈjenəsəs]

    美式

    • n.
      a theory that variations in evolution follow a particular direction and are not merely sporadic ...

    Oxford American Dictionary