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Meaning of trigamy

trig•a•my

Pronunciation: (trig'u-mē), [key]
— n.
  1. the state of having three wives or three husbands at one time.
  2. the state of having been lawfully married to three wives or three husbands at different times.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.