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From The Collaborative International Dictionary of English v.0.48:
Nonexistence \Non`ex*ist"ence\, n. 1. The state of not existing; absence of existence; the negation of being; -- usually used with reference to existince in the real world, or logical possiblity; as, the nonexistence of vaporware does not go unnoticed long. --A. Baxter. Syn: nonentity. [1913 Webster +PJC] 2. A thing that has no existence. --Sir T. Browne. [1913 Webster]