Definition of decider noun from the Oxford Advanced Learner's Dictionary

 

decider

 noun
noun
BrE BrE//dɪˈsaɪdə(r)//
 
; NAmE NAmE//dɪˈsaɪdər//
 
[usually singular]
 
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the game, race, etc. that will decide who the winner is in a competition the international title decider against Holland
See the Oxford Advanced American Dictionary entry: decider