1) Absence of existence 2) Nonbeing 3) Nonentity 4) Nothingness 5) The state of not existing 1) Impossibility 2) Impossibleness 3) Inexistence 4) Irreality 5) Naught 6) Nonentity 7) Nothing 8) Nothingness 9) Nullity 
• (n.) A thing that has no existence. • (n.) Absence of existence; the negation of being; nonentity. • (n.) A thing that has no existence. • (n.) Absence of existence; the negation of being; nonentity.
Non`ex·ist'ence noun 1. Absence of existence; the negation of being; nonentity. A. Baxter. 2. A thing that has no existence. Sir T. Browne. 
[n] - the state of not existing
nonentity noun the state of not existing
absence of existence. · a thing that has no existence.