Final answer:
Polygamy is the concurrent marriage to multiple partners of the letter D, and is accepted in various cultures globally, primarily in the form of polygyny, the marriage of one man to multiple women.
Step-by-step explanation:
The term used to refer to the concurrent marriage of a person of one sex with two or more members of the opposite sex is Polygamy. Specifically, when the marriage involves one man with multiple wives, it is known as polygyny, which is the most common form of polygamy. Polygamy is socially sanctioned and can be found in various societies around the world, particularly in northern Africa and east Asia. It arises for a variety of reasons, including social status, population growth, religious ideologies, and social adaptations to environments with high mortality rates or warfare.