Omniscient \Om*nis"cient\, a. [Omni- + L. sciens, -entis, p. pr. of scire to know: cf. F. omniscient. See {Science}.] Having universal knowledge; knowing all things; infinitely knowing or wise; as, the omniscient God. -- {Om*nis"cient*ly}, adv. For what can scape the eye Of God all-seeing, or deceive his heart Omniscient? --Milton.