To Be Decided
To Be Settled
intransitive verb, godan verb
You've hopefully seen the word 決める before. This is similar, except instead of deciding something, something gets decided. Rules are decided, a schedule gets decided — that kind of thing. It's intransitive, so it doesn't take a direct object. So 決まる means to be decided.
Verbs ending in okurigana that rhyme with ある tend to be intransitive like this. You can remember this because if something is ある, it's just there, existing, not acting on anything else. That's why verbs that sound like it are often intransitive too!
The reading is the same as 決める, so make sure you know that word so you can apply that knowledge over here.
仕事が決まる
job is decided
時間が決まる
the time is decided
場所が決まる
location is decided
やることは決まる
task is decided
心は決まる
one's mind is made up
これは決まる
this will be decided
行くことに決まる
to be decided that someone will go
五日に決まる
to be decided on the fifth
一年前に決まる
to be decided a year in advance
ねえママ、今日は何を食べるか決まるのはいつ？
Hey mom, when will it be decided what we will eat today?
いつが入学の日か決まりました？
Has the day of enrollment been decided?
ルームメイトの数が多すぎて、中々家のルールが決まらない。
There are too many roommates and the house rules have yet to be decided.