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2 definitions found
From: Webster's Revised Unabridged Dictionary (1913)
 Haec·ce·i·ty  Logic Literally, this-ness.  A scholastic term to express individuality or singleness; as, this book.
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From: WordNet (r) 2.0
 haecceity
      n : the essence that makes something the kind of thing it is and
          makes it different from any other [syn: quiddity]