'omniscient' originates from Latin, specifically the word 'omniscientem,' where 'omni-' meant 'all' and 'sciens' meant 'knowing.'

'omniscientem' transformed into the French word 'omniscient,' and eventually became the modern English word 'omniscient' through Middle English.

Initially, it meant 'all-knowing,' and this meaning has largely remained the same in modern usage.