om·nis·cient 
(ŏm-nĭshənt)
(ŏm-nĭshənt)adj.
Having total knowledge; knowing everything: an omniscient deity; the omniscient narrator.
n.
1. One having total knowledge.
2. Omniscient God. Used with the.
[Medieval Latin omnisciēns, omniscient- : Latin omni-, omni- + Latin sciēns, scient-, present participle of scīre, to know; see skei- in the Appendix of Indo-European roots.]
om·niscience, om·niscien·cy n.
om·niscient·ly adv.