a system for breaking a tie score at the end of regulation play by establishing a winner through special additional play, usually of a fairly short duration, as in tennis and soccer.
Also, tiebreak.

1960–65; tie + breaker1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Trivia toss-up tiebreaker in case of equally worthy patients:.
The department may order a tiebreaker medical examination.
In the event that there is not sufficient capacity to meet all equal maximum
  bids, pipelines apply a tiebreaker mechanism.
Play will be as continuous as possible, but there is usually a short break
  before the tiebreaker questions begin.
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