[eg-zi-sten-shuhl, ek-si-]
pertaining to existence.
of, pertaining to, or characteristic of existentialism: an existential hero.

1685–95; < Late Latin existentiālis relating to existing. See existence, -al1

existentially, adverb
nonexistential, adjective
nonexistentially, adverb
unexistential, adjective
unexistentially, adverb
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World English Dictionary
existential (ˌɛɡzɪˈstɛnʃəl)
1.  of or relating to existence, esp human existence
2.  philosophy pertaining to what exists, and is thus known by experience rather than reason; empirical as opposed to theoretical
3.  logic denoting or relating to a formula or proposition asserting the existence of at least one object fulfilling a given condition; containing an existential quantifier
4.  of or relating to existentialism
5.  a.  an existential statement or formula
 b.  short for existential quantifier

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1690s, "pertaining to existence," from L.L. existentialis, from existentia (see existence). As a term in logic, from 1819; in philosophy, from 1937, tracing back to the Dan. work of Kierkegaard (see existentialism). Related: Existentially.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The future itself would stand in grave danger, for the failure of nuclear
  deterrence could pose an existential threat to humanity.
Terrorism is an existential condition and won't be defeated militarily.
For a science writer, this quandary is something close to existential.
If privileged white folks grappling with existential angst fills you with
  dread, this is a movie to avoid.
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