non-existence

/N AA1 N EH0 G Z IH0 S T AH0 N S/
noun
  1. 1

    The state of not existing.

    โ€œThe nonexistence of Father Christmas and the Tooth Fairy came as something of a shock.โ€

Source: https://en.wiktionary.org/wiki/non-existence, https://en.wiktionary.org/wiki/nonexistence