Bigamies refer to the act of having more than one spouse at the same time. Synonyms for this term include polygamy, plurality, multiplicity, and prolificacy. Polygamy describes the practice of having multiple spouses of either sex. Plurality refers to the state of having multiple spouses or partners. Multiplicity is a more general term for having multiple instances or relationships. Prolificacy describes the act of having numerous marriages or sexual relationships. Other related terms include polyamory, which refers to having more than one romantic or sexual partner, and monogamy, which is the practice of having one spouse or partner at a time.