bigamy Look up bigamy at Dictionary.com
c.1250, from O.Fr. bigamie, from L.L. bigamus "twice married," from bi- "double" + Gk. gamos "marrying" (see gamete).
"Bigamie is unkinde ðing, On engleis tale, twie-wifing." [c.1250]
Bigamist is attested from 1631.