Polygamy is a form of polyamory where a person has more than one spouse at one time. It is also called plural marriage. In the United Sates and the United Kingdom, this is illegal.
Polygamy as an institution continues in much of the developing world. However, even in cultures that permit polygamy, its practice may nevertheless be discouraged. The Islamic Qu'ran, for example, suggests men restrict themselves to one wife: "If you have more than one wife, you will never be able to treat them equitably...and if you cannot treat them equitably then you should not engage in the practice at all."
A person who has more than one spouse is involved in bigamy, and that person can be found legally guilty of bigamy in a court of law.
- More information on this topic is available at [ Wikipedia:Polygamy ]