一いっ夫ぷ一いっ婦ぷ制せい

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Meanings

1

expression, noun

Refers to the social or legal system of being married to only one person at a time.

one, one radical (no.1)

夫husband, man

婦lady, woman, wife

制system, law, rule

一いっ夫ぷ多た妻さい制せい
一夫多妻制 means polygyny (one husband, multiple wives), the opposite of 一夫一婦制.
一いっ妻さい多た夫ふ制せい
一妻多夫制 means polyandry (one wife, multiple husbands), another contrasting system.

Compound of 一夫 (one husband), 一婦 (one wife), and 制 (system). The reading いっぷいっぷせい follows standard on'yomi with gemination.