The state of not being, not existing, or not being perceptible.(noun)
The state of existing in something(noun)
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Use "inexistence" in a sentence
"I believe that the inexistence of the universe means that JG Ballard is not, nor ever will be, dead."
"Never the murdered finalities of wherewhen and yesno, impotent nongames of wrongright and rightwrong; never to gain or pause, never the soft adventure of undoom, greedy anguishes and cringing ecstasies of inexistence; never to rest and never to have; only to grow."
"Now, this new is sort of weird to report only because I think we have never posted a story about Alicia Silverstone since we have been inexistence."