'antipolygamy' originates from Modern English, specifically the compound 'anti-' + 'polygamy', where 'anti-' meant 'against' and 'polygamy' meant 'many marriages'.

'polygamy' comes from Greek 'polygamia' (from 'poly-' meaning 'many' and 'gamos' meaning 'marriage'); the term passed through Latin/Old French into English as 'polygamy', and 'antipolygamy' was formed in English by adding the prefix 'anti-'.

Initially, it meant 'opposition to polygamy', and over time it has retained that core meaning as the term for the stance or movement against multiple marriage.