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Webster 1913 Edition

Noun.

[L.

trigamia

,Gr. [GREEK]: cf. F.

trigamie

. See

The act of marrying, or the state of being married, three times; also, the offense of having three husbands or three wives at the same time.

Noun.

[Gr. three, and marriage.] State of being married tree times; or the state of having three husbands or three wives at the same time.

trigamy ‎(countable and uncountable, plural trigamies)

the state of having three spouses simultaneously