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From The Collaborative International Dictionary of English v.0.48:
Heterogamy \Het`er*og"a*my\, n. [See Heterogamous.] [1913 Webster] 1. (Bot.) The process of fertilization in plants by an indirect or circuitous method; -- opposed to orthogamy. [1913 Webster] 2. (Biol.) That form of alternate generation in which two kinds of sexual generation, or a sexual and a parthenogenetic generation, alternate; -- in distinction from metagenesis, where sexual and asexual generations alternate. --Claus & Sedgwick. [1913 Webster]