A more thorough explanation:

Definition: A polygamist is someone who has multiple spouses at the same time or someone who supports the practice of polygamy.

• John is a polygamist and has three wives.
• The religious leader was a polygamist and had many wives.
• Some cultures allow polygamy and consider it a normal practice.

The first two examples illustrate the first definition of a polygamist, which is someone who has multiple spouses at the same time. John and the religious leader both have more than one wife. The third example illustrates the second definition of a polygamist, which is someone who supports the practice of polygamy. In some cultures, polygamy is considered a normal practice and is accepted by society.