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Having total knowledge; knowing everything: an omniscient deity; the omniscient narrator.
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 Indo-European roots.]

om·nis′cience, om·nis′cien·cy n.
om·nis′cient·ly adv.
References in periodicals archive ?
For, whereas it hath been the labour of the pious and learned in all ages to mount man to God, (as much as might be), by a sacred adoration (which the more humble, the more high) of the Divine Incomprehensibleness; this wretch did seek to stoop God to man, by debasing his purity, assigning him a material body; confining his immensity, as not being everywhere; shaking his immutability, as if his will were subject to change; darkening his omnisciency, as uncertain in future contingents: with many more monstrous opinions, fitter to be remanded to hell, than committed to writing.