1. A word, such as all or many, that expresses a quantity
  2. The operator, represented by either of the symbols (universal quantifier) or (existential quantifier), used in predicate calculus to indicate the degree that predicate is true for a specified set.
  3. A symbol or symbols in a regular expression indicating the number of characters to be matched.

The above text is a snippet from Wiktionary: quantifier
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