Polygamy

The having of a plurality of wives or husbands at the same time; usually, the marriage of a man to more than one woman, or the practice of having several wives, at the same time; -- opposed to monogamy; as, the nations of the East practiced polygamy. See the Note under Bigamy, and cf. Polyandry.

The state or habit of having more than one mate.

The condition or state of a plant which bears both perfect and unisexual flowers.

the condition or practice of having more than one spouse at a time