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Definition of tiebreaker noun from the Oxford Advanced American Dictionary

     

    tiebreaker

     noun
    noun
    NAmE//ˈtaɪˌbreɪkər//
     
     
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  1. 1 (in tennis) a period of extra play to decide who is the winner of a set when both players have won six games The first set was won on a tiebreaker. Nadal won the tiebreaker 7-5.
  2. 2 an extra question in a competition to decide who is the winner when two or more of those taking part have equal scores
See the Oxford Advanced Learner's Dictionary entry: tiebreaker