omni

1. a combining form meaning “all,” used in the formation of compound words: omnifarious; omnipotence; omniscient.

combining form

1. all or everywhereomnipresent

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).