Hypertext Webster Gateway: "nonexistence"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Nonexistence \Non`ex*ist"ence\, n.
1. Absence of existence; the negation of being; nonentity.
--A. Baxter.
2. A thing that has no existence. --Sir T. Browne.
From WordNet (r) 1.7 (wn)
nonexistence
n : the state of not existing [ant: {being}]
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