Webster's English Dictionary

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conclusive

con.clu.sive \-'klu:-siv, -ziv\ aj 1: of or relating to a conclusion  2: 
   DECISIVE, FINAL  mean bringing to an end. CONCLUSIVE applies to reasoning 
   or logical proof that puts an end to debate or questioning; DECISIVE may 
   apply to something that ends a controversy, a contest, or any uncertainty; 
   DETERMINATIVE adds an implication of giving a fixed course or direction; 
   DEFINITIVE applies to what is put forth as final and permanent - 
   con.clu.sive.ly av SYN syn CONCLUSIVE, DECISIVE, DETERMINATIVE, DEFINITIVE