haecceitas

Noun

 * 1) The essence of a particular thing; those qualities that define it and make it unique.

Etymology
Coined by Duns Scotus from, a form of. Literally “this-ness”.

Noun

 * 1)  The essence of a particular thing; those qualities that define it and make it unique.

Etymology
.

Noun

 * 1)  haecceity