noun
deciding match; playoff; runoff
Used in sports and competitions for a match that determines the winner when there is a tie or final round.
優勝を決める決定戦が明日行われる。
The deciding match to determine the champion will be held tomorrow.
同点だったので、決定戦
Since they were tied, it went into a playoff.
Compound of 決定 (decision, determination) and 戦 (match, battle).