Hypertext Webster Gateway: "haecceity"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Haecceity \H[ae]c*ce`i*ty\, [L. h[ae]cce this.] (Logic)
Literally, this-ness. A scholastic term to express
individuality or singleness; as, this book.
From WordNet (r) 1.7 (wn)
haecceity
n : the essence that makes something the kind of thing it is and
makes it different from any other [syn: {quiddity}]
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