Webster's Revised Unabridged Dictionary · 1913

Omniscient

Omniscient , adjective

[Omni- + Latin sciens, -entis, present participle of scire to know: compare French omniscient. See Science.]

Having universal knowledge; knowing all things; infinitely knowing or wise; as, the omniscient God.
For what can scape the eye Of God all-seeing, or deceive his heart Omniscient? — Milton