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[mon-uh-thee-iz-uh m] /ˈmɒn ə θiˌɪz əm/
the doctrine or belief that there is only one God.
Origin of monotheism
First recorded in 1650-60; mono- + (poly)theism
Related forms
monotheist, noun, adjective
monotheistic, monotheistical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for monotheism


the belief or doctrine that there is only one God
Derived Forms
monotheist, noun, adjective
monotheistic, adjective
monotheistically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for monotheism

"belief that there is but one god," 1650s, from Greek mono-, comb. form of monos "single, alone" (see mono-) + theos "a god" (see Thea).

Online Etymology Dictionary, © 2010 Douglas Harper
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monotheism in Culture

monotheism definition

A belief in one god. Judaism, Christianity, and Islam are all monotheistic religions. (Compare polytheism.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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