Dictionary.com
Thesaurus.com

haecceity

British  
/ hiːk-, hɛkˈsiːɪtɪ /

noun

  1. philosophy the property that uniquely identifies an object Compare quiddity

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of haecceity

C17: from Medieval Latin haecceitas, literally: thisness, from haec, feminine of hic this

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

We might take a lesson from John Duns Scotus, one of the most important Franciscan theologians, who stressed the concept of “thisness,” or “haecceity.”

From Washington Post