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Definition 2024

notness ‎(uncountable)

(philosophy) The state of not being; nonexistence.
- 2004, Martin Kavka, Jewish messianism and the history of philosophy
  For Heidegger, it is in the notness of nonbeing that we find the possibility for understanding an object, not simply as something other than some other sensible object but also as the being that is other than being.