Existential

1. Of, relating to, or dealing with existence.
2. Based on experience; empirical.
3. Of or as conceived by existentialism or existentialists: an existential moment of choice.
4. Linguistics Of or relating to a construction or part of a construction that indicates existence, as the words there is in the sentence There is a cat on the mat.

n. Linguistics An existential word or construction. ex'is·ten'tial·ly adv.

see: Existential Philosophy