Antonyms of noun nonexistence

1 sense of nonexistence

Sense 1
nonexistence, nonentity -- (the state of not existing)
       Antonym of existence (Sense 1)
      => being, beingness, existence -- (the state or fact of existing; "a point of view gradually coming into being"; "laws in existence for centuries")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun nonexistence

1 sense of nonexistence

Sense 1
nonexistence, nonentity -- (the state of not existing)
       => nonbeing -- (the state of not being)