• Webster's Revised Unabridged Dictionary
    • n Homogamy (Bot) The condition of being homogamous.
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Century Dictionary and Cyclopedia
    • n homogamy The state of being homogamous; fertilization in a plant when the stamens and pistil of a hermaphrodite flower mature simultaneously.
    • n homogamy Assortative mating; the pairing or mating of animals, or the marriage of human beings, with some common distinctive characteristic considered apart from the question whether the mating is due to conscious selection of, or preference for, this characteristic or is unintentional or unconscious; sexual selection in its widest sense.
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In literature:

But when we go outside the racial field this tendency to homogamy disappears at once.
"Studies in the Psychology of Sex, Volume 4 (of 6)" by Havelock Ellis
So much then for homogamy, or isolation of the discriminate order.
"Darwin, and After Darwin (Vol 3 of 3)" by George John Romanes