n. The state of being homogamous; fertilization in a plant when the stamens and pistil of a hermaphrodite flower mature simultaneously.n. 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.