Logic. an expression, as “all” or “some,” that indicates the quantity of a proposition. Compare existential quantifier, universal quantifier.
a word, especially a modifier, that indicates the quantity of something.

1875–80; quantify + -er1

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World English Dictionary
quantifier (ˈkwɒntɪˌfaɪə)
1.  logic
 a.  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)(FxGx), rendered "all Fs are Gs"
 b.  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

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