Definition of "omniscience"
noun
countable and uncountable, plural omnisciences
The capacity to know everything.
Quotations
If, a few pages back, the present writer claimed the privilege of peeping into Miss Amelia Sedley's bedroom, and understanding with the omniscience the novelist all the gentle pains and passions which were tossing upon that innocent pillow, why should he not declare himself to be Rebecca's confidante too, master of her secrets, and seal-keeper of that young woman's conscience?
1847 January – 1848 July, William Makepeace Thackeray, chapter 15, in Vanity Fair […], London: Bradbury and Evans […], published 1848