Etymology
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bigamist (n.)

"one who has had two or more wives or husbands at once," 1630s; see bigamy + -ist. Earlier in the same sense was bigame (mid-15c.), from Old French bigame, from Medival Latin bigamus.

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Definitions of bigamist

bigamist (n.)
someone who marries one person while already legally married to another;
From wordnet.princeton.edu