Simple Definition of omniscient
: knowing everything : having unlimited understanding or knowledge
Full Definition of omniscient
1 : having infinite awareness, understanding, and insight
2 : possessed of universal or complete knowledge
Did You Know?
One who is "omniscient" literally "knows all." The word, which has been part of English since at least the beginning of the 17th century, brings together two Latin roots: the prefix omni-, meaning "all," and the verb scire, meaning "to know." You will recognize "omni-" as the prefix that tells all in such words as "omnivorous" ("eating all," or, more precisely, "eating both meat and vegetables") and "omnipotent" ("all-powerful"). "Scire" likewise has a number of other knowledge-related descendants in English, including "conscience," "science," and "prescience" (meaning "foreknowledge").
Origin of omniscient
New Latin omniscient-, omnisciens, back-formation from Medieval Latin omniscientia
First Known Use: circa 1604
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