classmate

noun

Etymology: From class + mate.

1. A student who is in the same class at school.

   “Danny and I have been classmates for five years, but I've never spoken to him outside of lessons.”

   “She was your classmate at the village school from first grade.”

2. A member of a different sort of class, such as locomotives etc.

   “The Class 87 is the only main line-certified member of the fleet left in the UK, although there are 21 classmates in use overseas [...]”