Longman Dictionary of Contemporary English
omni-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ an omniscient narrator
▪ Goats are omnivores.
The Collaborative International Dictionary
Omni-
Omni- \Om"ni-\ [L. omnis all.] A combining form denoting all, every, everywhere; as in omnipotent, all-powerful; omnipresent; omnivorous.
Douglas Harper's Etymology Dictionary
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- (1) "to work, produce in abundance" (see opus).
Wiktionary
omni-
pre. a combining form meaning "all", used in the formation of compound words.