This is the 1869th most frequent Japanese word.
決まる
"To be decided"
In this sentence, '決まった' indicates that the decisive event has occurred, resulting in the conclusion of the matter.
試合の勝敗は最後のプレーで決まった。
The outcome of the match was decided by the final play.
Here, '決まっていない' expresses that no final decision has been made regarding the plans.
休暇の予定はまだ決まっていない。
The vacation plans have not been decided yet.
In this example, '決まる' refers to the process of selecting or determining the new leader as a result of the voting activity.