Below are possible answers for the crossword clue Decisive one.
7 letter answer(s) to decisive one
ARBITER
someone chosen to judge and decide a disputed issue; "the critic was considered to be an arbiter of modern literature"; "the arbitrator's authority derived from the consent of the disputants"; "an umpire was appointed to settle the tax case"
someone with the power to settle matters at will; "she was the final arbiter on all matters of fashion"
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