The Collaborative International Dictionary
Existential \Ex`is*ten"tial\, a.
Having existence. [Archaic]
--Bp. Barlow.of or pertaining to, or having the character of, existentialism.
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(Logic) specifying actual existence, rather than only possibility; as, the existential operator.
Existentially as well as essentially intelligent.
--Colerige.
Wiktionary
adv. In an existential manner
Usage examples of "existentially".
It is physically, theoretically, existentially, and actually impossible to have one without the other.
The Law of Totality affects individuals by embracing them existentially in the life of the organism.
This is the operating principle that guides the research of Niles Caulder, the Chief of the DOOM PATROL, as he deliberately provokes 'accidents' that transform self-satisfied conformists into companionless, existentially tormented super-heroes.