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Polygamy is defined as marriage that involves more than one partner. This term encompasses various forms of marital arrangements where an individual may have multiple spouses simultaneously. The key aspect of polygamy is that it does not limit the number of partners to just one, thereby distinguishing it from monogamy, which is marriage between two people.

It's worth noting that polygamy can further be divided into specific types, such as polygyny, where one man is married to multiple women, and polyandry, where one woman is married to multiple men. The definition emphasizes the central idea that polygamy includes multiple partners, in contrast to monogamous relationships.