haecceity :

/hεk*sé*ε*tee/

A Deleuzian concept derived from John Don Scotus' use of the term haec meaning 'this thing', or conceptually, thus is this thing as an entire assemblage in its individuated subjective aggregate; it is the 'this-ness' of a thing, field or person. Haecceity is a set of speeds and slownesses defined by longitudes and latitudes, by speeds and affects, independently of forms and subjects. It is made up not of points, but of lines, with neither beginning nor end, origin nor destination, perpetually remaining in a state of the middle, and thus open to entering into infinitesimal compositions. Haecceity denotes us, the becoming of our thoughts and actions as constituting our being at the end of metaphysics, and in doing so, reflects the world back to itself: you will yield nothing to haecceities unless you realize that that is what you are, and you are nothing but that. *

* Deleuze and Guattari, A Thousand Plateaus, pp. 262-263. Excerpted by permission of the Continuum International Publishing Group.