quantifier Syllabification: (quan·ti·fi·er)Pronunciation: /ˈkwäntəˌfīər/Definition of quantifier noun Logic an expression (e.g., all, some) that indicates the scope of a term to which it is attached. Grammar a determiner or pronoun indicative of quantity (e.g., all, both). quantifier in other Oxford dictionaries Definition of quantifier in the British & World English dictionary