Jul 1, 2026 omniscient äm-ˈni-shənt 3 syllables rare ‹ adjective.having infinite awareness, understanding, and insight a novel with an omniscient narrator =a narrator who knows what all the characters are doing and thinkingthe narrator seems an omniscient person who tells us about the characters and their relations adjective.possessed of universal or complete knowledge the omniscient God › Origin New Latin omniscient-, omnisciens, back-formation from Medieval Latin omniscientia.