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Entry 1 sense Webster, 1913

Haecceity

/(hĕk*sē"ĭ*ty̆)/ · Haec·ce·i·ty · IPA /hɛkˈsiː.ə.tiː/
01 Literally, this-ness. A scholastic term to express individuality or singleness; as, this book.
  1. 1.
    Literally, this-ness. A scholastic term to express individuality or singleness; as, this book.(Logic)