Can anyone tell me the definition of ipsissimosity?

Answer 1

" ... Nietzsche's invented word . And when Nietzsche used it he prefaced it with "accursed": Nietzsche points to his own accursed ipsissimosity. Nietzsche forces us to gaze at him, to judge him and his accursed ipsissimosity while we are judging his writings: ... "

Answer 2

did a little web search, this is the Nietzsche quote
"However gratefully one may go to welcome an objective spirit—and who has not been sick to death of everything subjective and its accursed ipsissimosity! -in the end one has to learn to be cautious with one's gratitude too and put a stop to the exaggerated way in which the depersonalization of the spirit is today celebrated as redemption and transfiguration, as if it were the end in itself..."(Beyond Good & Evil)

These are a couple explanations/definitions I copy/pasted off some blogs:

"...Nietzsche's word....but shan't find it in a dict. Latin origin, ispe 'self', viz. ipso facto, ipse dixit, eo ipso, ipseity. I must own, ipsissimosity sounds better"

"West mentions Beckett's advice to immerse oneself in one's own precious ipsissimosity, aka selfhood, aka "what will this particular work do to me?""

Ipsissimosity - The character of having to do with one's own, belong to one. Ipsissimous (adj.)

The root (etymological) is latin, one own's word is "ipsissima verba." For example, the attorney's position on racial segregation is supported by the ipsissima verba of the Supreme Court in Brown v. Board of Education.