Source : Webster's Revised Unabridged Dictionary (1913)

Qualifier \Qual"i*fi`er\, n.
   One who, or that which, qualifies; that which modifies,
   reduces, tempers or restrains.

Source : WordNet®

qualifier
     n 1: a contestant who meets certain requirements and so qualifies
          to take part in the next stage of competition; "the
          tournament was won by a late qualifier"
     2: a content word that qualifies the meaning of a noun or verb
        [syn: {modifier}]