- marriage between people from similar sociological or educational backgrounds. Compare with heterogamy (sense 3).
- 2 Botany a state in which the flowers of a plant are all of one type (either hermaphrodite or of the same sex). Compare with heterogamy (sense 2).
- 3 Botany the simultaneous ripening of the stamens and pistils of a flower, ensuring self-pollination. Compare with dichogamy.
late 19th century: from homo- 'same' + Greek gamos 'marriage'