Etymology
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omniscient (adj.)

"possessing knowledge of all things, having universal knowledge," c. 1600, from Modern Latin omniscientem (nominative omnisciens) "all-knowing," a back-formation from Medieval Latin omniscientia "all-knowledge," from Latin omnis "all" (see omni-) + scientia "knowledge" (see science). Related: Omnisciently.

updated on August 23, 2019

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Definitions of omniscient from WordNet

omniscient (adj.)
infinitely wise;
Synonyms: all-knowing
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.