Monogamy is a marriage system in which a person has only one spouse at a time.
Bigamy: Marrying another person while already legally married.
Polyandry: One woman having multiple husbands simultaneously.
Monogamy: One husband and one wife at a time.
Exogamy: Marriage outside one’s own social or kinship group.
According to a cross-cultural research review published in Frontiers in Ecology and Evolution (2019), monogamy is the dominant marriage type within societies, and most individual marriages are monogamous, even in societies that permit polygyny.