decisive decisive /dɪˈsaɪsɪv/

adjective

1. () Determining or having the power to determine an outcome  ( decisive )
   determining or having the power to determine an outcome
    Cast the decisive vote
   cast the decisive vote
    Two factors had a decisive influence
   two factors had a decisive influence
   
2. () Unmistakable  ( decisive )
   unmistakable
    Had a decisive lead in the polls
   had a decisive lead in the polls
   
3. Forming or having the nature of a turning point or crisis  ( decisive , critical )
   forming or having the nature of a turning point or crisis
    A critical point in the campaign
   a critical point in the campaign
    The critical test
   the critical test
   
4. Characterized by decision and firmness  ( decisive )
   characterized by decision and firmness
    An able and decisive young woman
   an able and decisive young woman
    We needed decisive leadership
   we needed decisive leadership
    She gave him a decisive answer
   she gave him a decisive answer