An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) To have actual being or reality; to be.
2) To have life; to live.

M.E., from O.Fr. exister, ultimately from pr.p. of L. existere/exsistere "to stand forth, appear; to exist, be;" from → ex- + sistere "cause to stand," from PIE *sta-, cf. Pers. istâdan "to stand," → state.

Hastumand budan, from Mid.Pers. hastumand "existing, existent," from hast, ast 'is" (infinitive hastan, astan); O.Pers. astiy; Av. asti "is;" O.Pers./Av. root ah- "to be;" cf. Skt. as-; Gk. esti; L. est; PIE *es-, + euphonic -u-, + -mand possession suffix, → -ist, + budan "to be," to become;" Mid.Pers. butan "to be ,become," from O.Pers./Av. bav- "to be; become, take place," Av. buta- perf. ptcpl. pass., bavaiti "becomes," Skt. bhavati "becomes, happens," bhavah "becoming; condition, state," PIE *bheu- "to be, come into being, become;" cf. Gk. phu- "become," phuein "to bring forth, make grow," L. fui "I was" (perf. tense of esse), futurus "that is to be, future," Ger. present first and second person sing. bin, bist, E. to be, O.Ir. bi'u "I am," Lith. bu'ti "to be," Rus. byt' "to be."

Math.: The fact that at least one → solution exists for a given → problem.

→ exist; → -ence.

Math: The question of whether a → solution to a given → problem exists.

→ existence; → problem.

Math.: An → argument that establishes an → existence theorem.

→ existence; → proof.

Math: A theorem that asserts the existence of at least one object, such as the → solution to a → problem or → equation.

→ existence; → theorem.

Existing; having existence.

→ exist.

1) Of or relating to → existence, especially  human existence.
2) Philo.:  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 (Dictionary.com).

From L.L. existentialis, → existence, → -al.

Hastiyâl, from hasti, → existence, + -al a suffix of attributes forming adjectives that often become nouns, in this case preferred to -i because hasti ends in -i, → -al.

A symbol of → predicate logic which expresses that the statements within its scope are → true for at least one instance of something. The symbol ∃ is used as the existential quantifier. Existential quantifiers are normally used in logic in → conjunction with → predicate symbols, which say something about a → variable or → constant, in this case the variable being quantified (→ quantify, → quantification).

→ existential; → quantifier.

A philosophical attitude associated especially with Heidegger, Jaspers, Marcel, and  Sartre, and opposed to → rationalism and  → empiricism, that stresses the individual's  unique position as a self-determining agent responsible for the authenticity of his or  her choices (Dictionary.com).

→ existential; → -ism.

An advocate of → existentialism.

→ existential; → -ist.

Math.: The fact that no → solution exists for a given → problem. In mathematics, nonexistence usually is a matter of impossibility.

→ non-; → existence.