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  1. Oxford American Dictionary

    alternation of generations

    • IPA[ˌôltərˈnāSHən əv]
    • n.
      a pattern of reproduction occurring in the life cycles of many lower plants and some invertebrates, involving a regular alternation between two distinct forms. The generations are alternately sexual and asexual (as in ferns) or dioecious and parthenogenetic (as in some jellyfish).

    • noun: alternation of generations