
der Mitschüler
classmate
A male person who attends the same school or class as you.
Er hat sich mit einem Mitschüler für die Projektarbeit zusammengetan.
He teamed up with a classmate for the project work.
classmate
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classmate
A male person who attends the same school or class as you.
Er hat sich mit einem Mitschüler für die Projektarbeit zusammengetan.
He teamed up with a classmate for the project work.
The word is made up of the prefix 'mit-' (together) and the noun 'der Schüler' (the student/pupil). A Mitschüler is therefore literally a student who attends school together with you.
Mein bester Freund war auch mein Mitschüler in der Grundschule.
My best friend was also my classmate in elementary school.
'Der Mitschüler' (the classmate) is a noun of the n-declension. This means it takes the ending '-n' in all cases except the nominative singular.
Hast du den neuen Mitschüler schon kennengelernt?
Have you already met the new classmate?
This word is used exclusively in a school context to describe boys or men who attend the same class or school.
Er hat seinen Mitschülern bei den Hausaufgaben geholfen.
He helped his classmates with their homework.
classmate
Mitschüler and Klassenkamerad both refer to a boy from the same school environment. Mitschüler can mean that you attend the same school, while Klassenkamerad explicitly requires that you are in the same class. Use Klassenkamerad when you are in the same class, and Mitschüler when you share only the school or both the school and the class.

Tom ist mein Mitschüler an derselben Schule, aber er geht in eine andere Klasse.
Tom is my classmate at the same school, but he is in a different class.
Tom ist mein Klassenkamerad, weil wir jeden Morgen in derselben Klasse sitzen.
Tom is my classmate because we sit in the same class every morning.