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1.
One having total knowledge
No mortal being is omniscient, though this could be used to state that some person knows almost everything about a thing.
- omniscient God
- the omniscient narrator
by smart person December 24, 2004
 
2.
The name of the Administrator on the largest MyBB forum otherwise known as Hackforums.
Omniscient doesnt know fuck all about running a server.
by Anonymous235 November 25, 2011