'homogamy' originates from New Latin/Modern Latin, specifically the word 'homogamia', ultimately from Greek where the prefix 'homo-' meant 'same' and 'gamos' meant 'marriage'.

'homogamy' changed from Greek 'homogamos' (ὁμογάμος) and Medieval/Modern Latin 'homogamia' and eventually became the English word 'homogamy'.

Initially, it meant 'marriage or union of like types' in the literal sense; over time it broadened to technical senses in sociology, botany, and biology referring to similarity-based mating or simultaneous reproductive timing.