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a combining form meaning “all,” used in the formation of compound words:
omnifarious; omnipotence; omniscient.
Origin of omni-
< Latin, combining form of omnis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for omni


combining form
all or everywhere: omnipresent
Word Origin
from Latin omnis all
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 omni


word-forming element meaning "all," from Latin omni-, combining form of omnis "all, every, the whole, of every kind," of unknown origin, perhaps literally "abundant," from *op-ni-, from PIE root *op- "to work, produce in abundance" (see opus).

Online Etymology Dictionary, © 2010 Douglas Harper
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