tiebreaker - definition and synonyms

noun [countable] 

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/ˈtaɪˌbreɪkə(r)/
singulartiebreaker
pluraltiebreakers

or tiebreak 

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/ˈtaɪˌbreɪk/

  1. 1
    an extra question asked at the end of a quiz to decide who will win when two players have the same number of points
  2. 2
    in tennis and other sports, an extra game played to decide who will win when both players or teams have the same number of points