also: クラスメイト
Refers to a fellow student in the same class or grade at school.
彼は私のクラスメートです。
He is my classmate.
クラスメートと一緒に勉強した。
I studied with my classmates.
He became my classmate this year.
I've been classmates with her since elementary school.
I ran into an old classmate at the station.