Как по Английски будет полигамия

The practice or custom of having more than one wife or husband at the same time.

In the linnaean artificial system: the twenty-third class of plants, comprising those that bear both hermaphrodite and unisexual (male or female) flowers, on the same or different plants; (also) any of the orders of the class syngenesia that comprise plants bearing inflorescences composed of many florets (as in plants of the family asteraceae (compositae)).