Webster's English Dictionary

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perfective

per.fec.tive \p*r-'fek-tiv also 'p*r-fik-\ \p*r-.fek-'tiv-*t-e- also 
   .p*r-fik-\ aj archaic  1a: tending to make perfect  1b: becoming better  2: 
   expressing action as complete or as implying the notion of completion,  
   conclusion, or result {~ verb} - perfective n