The condition of being or of inhering per se.(noun)
The Century Dictionary (Public Domain)
Use "perseity" in a sentence
"A God, as distinguished from the absolute, creates things by projecting them beyond himself as so many substances, each endowed with _perseity_, as the scholastics call it."
"In this manner, it was argued that at the core of economic perseity, are non-predeterminable institutional innovations that act as channels of policy/regulatory circumvention."