Source : Webster's Revised Unabridged Dictionary (1913)

Perfective \Per*fect"ive\, a.
   Tending or conducing to make perfect, or to bring to
   perfection; -- usually followed by of. ``A perfective
   alteration.'' --Fuller.

         Actions perfective of their natures.     --Ray.

Source : WordNet®

perfective
     n 1: a tense of verbs used in describing action that has been
          completed (sometimes regarded as perfective aspect)
          [syn: {perfective tense}, {perfect}, {perfect tense}]
     2: the aspect of a verb that expresses a completed completed
        action [syn: {perfective aspect}]