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{ 1 }. [ 1913 Webster +PJC ]
2. A thing that has no existence. Sir T. Browne. [ 1913 Webster ]
[うむ(P);ゆうむ(ok), umu (P); yuumu (ok)] (n) (1) (See 有り無し) existence or nonexistence; presence or absence; (2) consent or refusal; yes or no; (3) { comp } flag indicator; presence or absence marker; (P)#5315