quantifier

[kwon-tuh-fahy-er] /ˈkwɒn təˌfaɪ ər/
noun
1.
Logic. an expression, as “all” or “some,” that indicates the quantity of a proposition.
Compare existential quantifier, universal quantifier.
2.
a word, especially a modifier, that indicates the quantity of something.
Origin
1875-80; quantify + -er1
British Dictionary definitions for quantifiers

quantifier

/ˈkwɒntɪˌfaɪə/
noun
1.
(logic)
  1. a symbol including a variable that indicates the degree of generality of the expression in which that variable occurs, as (∃x) in (∃x)Fx, rendered "something is an F", (x) in (x)(Fx→Gx), rendered "all Fs are Gs"
  2. any other symbol with an analogous interpretation: the existential quantifier, (∃x), corresponds to the words "there is something, x, such that …"
2.
(grammar) a word or phrase in a natural language having this role, such as some, all, or many in English