(US) A medical condition that started before a person's health insurance went into effect.

(logic) The operator, represented by the symbol ∃, used in predicate calculus to indicate that a predicate is true for at least one member of a specified set. Verbal equivalents include "there exists" and "there is".

A person who adheres to the philosophy of existentialism.

Of or pertaining to existentialism.

(philosophy, not countable) A twentieth-century philosophical movement emphasizing the uniqueness of each human existence in freely making its self-defining choices.

Of or relating to existence. / Concerning the very existence of something, especially with regard to extinction. / Based on experience; empirical. / (philosophy) Of, or relating to existentialism.

(linguistics) Ellipsis of existential clause. / (programming) Ellipsis of existential type.

(philosophy) Existence; state of existing.

In an existential manner

plural of existentialism