Entry 1 sense Webster, 1913 Qualifier /kwŏʹlĭ-fī-ər/ · Qual·i·fi·er · IPA /ˈkwɑ.lɪ.faɪ.ɚ/ 01 n. One who, or that which, qualifies; that which modifies, reduces, tempers or restrains. 1. One who, or that which, qualifies; that which modifies, reduces, tempers or restrains.