ex⋅is⋅ten⋅tial
/ˌɛgzɪˈstɛnʃəl, ˌɛksɪ-/
-adjective
1. pertaining to existence: I think, therefore, I kick ass. And if you don't start hitting the offensive glass, I'm going to kick yours.
2. of, pertaining to, or characteristic of existentialism: an existential hero.