omni

all; every

Spelled omni · omnis 'all, every'

Latin omnis meant all: an omniscient narrator knows everything, an omnipotent being has all power, and an omnibus gathers works into one volume.

Words built from it

omniscient — knowing everything
omni- (all) + scient (knowing)
omnipotent — having unlimited power
omni- (all) + potent (powerful)
omnipresent — present everywhere
omni- (all) + present (being here)
omnivorous — eating both plants and animals; also, eagerly taking in many kinds of things
omni- (all) + vor (devour) + -ous (characterized by)
omnibus — a collection of previously separate works in one volume; also, covering many items
omni- (all) + -bus (for)
omnidirectional — operating or extending in all directions
omni- (all) + directional (relating to direction)

insomniac — From insomnia, built from Latin in- 'not' and somnus 'sleep'; the letters omni occur within the word but do not mean 'all.'