heterogamy

noun

• 1chiefly Zoology the alternation of generations, especially between sexual and parthenogenetic generations.

• 2 Botany a state in which the flowers of a plant are of two or more types. Compare with homogamy (sense 2).
• another term for anisogamy.

• 3marriage between people from different sociological or educational backgrounds. Compare with homogamy (sense 1).