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1.
/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
by Ronald A.King November 19, 2005
 
2.
Bigamy is defined as having one wife too many.

See monogamy.
He practiced bigamy. He had one wife too many.
by Gandalf2349 December 20, 2005
 
3.
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.
by Bobert (Imma girl) December 05, 2006