existential

Of or relating to existence.

The third univerſal is appetite; every perfect and imperfect living creature acquires ſuſtenance to eate and drink. For exiſtential or ſenſual, I grant many, that there is a Sun that ſhineth, that the fire heateth, &c. yet a blind man and the Paralytick denies both.

[T]he essential cause of fiendish guilt, when it makes itself existential and peripheric— […] I find the only explanation of a moral phænomenon not very uncommon in the last moments of condemned felons—viz. the obstinate denial, not of the main guilt, which might be accounted for by ordinary motives, but of some particular act, which had been proved beyond all possibility of doubt, and attested by the criminal's own accomplices and fellow-sufferers in their last confessions: […]

Of or relating to existence.

an existential risk or threat

[Karl] Jaspers' main concern has been with existential dread, which he regards not as a symptom of mental illness, but as a result of rejecting religious faith. He proposes that man's only way out of existential dread is through a "leap into faith" which reconciles man with himself and with God, and provides an experience of the absolute which transcends mere sense experience.

Of or relating to existence.

In recent books on logic, distinction is made between two orders of inquiry concerning anything. First, what is the nature of it? how did it come about? what is its constitution, origin, and history? And second, What is its importance, meaning, or significance, now that it is once here? The answer to the one question is given in an existential judgment or proposition. The answer to the other is a proposition of value, what the Germans call a Werthurtheil, or what we may, if we like, denominate a spiritual judgment.

Of or relating to existentialism (“a philosophical movement emphasizing the uniqueness of each human existence in freely making its self-defining choices”).

Some existential thinkers are concerned with artistic expression only indirectly, that is, they are passionately interested critics and analysts of art works.

Relating to part of a clause that indicates existence (for example, there is).

Ellipsis of existential clause (“a clause that indicates the existence of something”).

In classical accounts of Finnish and Estonian grammar, the possibility of using the so-called partitive subject has been one definitional criterion for the category of existential clauses. […] We argue that existentials form a radial category, with a prototype and less canonical instances, where the prototype is clearly definable but the actual borderline between existentials and other clause types is fuzzy.

Ellipsis of existential type (“in a type system: a type that hides the underlying concrete type(s)”).