Classmate (noun)

1. A person who is in the same class as another person at school, college, or university.
2. A person who is in the same class or group as another person in an activity or profession.

Origin:

19th century: from class + mate.

Examples:

1. He became friends with his classmates.
2. She was very shy and didn't talk much to her classmates.
3. He was always top of his class, but none of his classmates were surprised.
4. His classmates thought he was a genius.
5. She wanted to invite her classmates to her birthday party.