a combining form meaning “all,” used in the formation of compound words: omnifarious; omnipotence; omniscient.
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Origin of omni-
< Latin, combining form of omnis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for omni-
all or everywhereomnipresent
Word Origin for omni-
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
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