What is Bigamy?
/noun/ -- The practice of fruadulently marrying more than one spouse
John married Jane without divorcing Mary and is thus guilty of the crime of Bigamy
Bigamy is defined as having one wife too many.
He practiced bigamy. He had one wife too many.
A kind of awkward word for your last name to derive from if you're a girl.
Jacklyn: Hello! I'm Jacklyn Bigam!
Random person: Bigam...? As in...?
Jacklyn: Bigamy. Yes. Shut up now.