The worship of or belief in more than one god.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "polytheism" in a sentence
"Marie's point about gaining an extra arena of potential conflict (gods v. gods) with polytheism is an interesting one -- also interesting to see some people address the question of whether or not the religion (s) of the tale are true, within the context of the tale."
"One of the advantages of polytheism is that it creates some flexibility."
"It is a bit of a difficulty in polytheism to to rank the gods."