This is the 4806th most frequent Japanese word.
決まり
"決まり" means "rule," "custom," or "decision."
In this sentence, "決まり" refers to rules or predetermined guidelines adhered to in a particular context, such as a classroom environment.
このクラスの決まりを守ってください。
Please follow the rules of this class.
Here, "決まり" is used to denote a person's routine or established habit, implying something regularly or customarily done.
今日は早寝するのが私の決まりです。
Today, going to bed early is my routine.
In this sentence, "決まり" is utilized in the form of 'making a decision,' signifying the settled choice or resolved action regarding one's appearance.