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Meaning of assortative mating

assort'ative mat'ing

Pronunciation: [key]
— Animal Behav., Psychol. Animal Behav.,Psychol.
  1. the reproductive pairing of individuals that have more traits in common than would likely be the case if mating were random (contrasted with disassortative mating). Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.