tiebreaker Syllabification: (tie·break·er)Pronunciation: /ˈtīˌbrākər/Translate tiebreaker | into Spanish Definition of tiebreaker noun a means of deciding a winner from competitors who have tied, in particular (in tennis) a special game to decide the winner of a set when the score is six games all. tiebreaker in other Oxford dictionaries Definition of tiebreaker in the British & World English dictionary