The offense of having two husbands or wives at the same time, the one de jure and the other de facto 1 Bishop, Mar & Div § 296 Strictly speaking, bigamy means "twice married", as its derivative shows This was never an offense at common law; it was made an offense by the canonists Polygamy is the proper term; but, by long usage, bigamy has come to mean the state of a man who has two wives, or a woman who has two husbands, at the same time 4 Bl Com 163; 81 Pa 432, 430; 1 law Quar Rev 474-76 (1885)
Bigamy is the crime of marrying a person when you are already legally married to someone else. the crime of being married to two people at the same time monogamy, polygamy polygamy (bigamia, from bi- ( BI-) + -gamia ( -GAMY))