IPA: /ˈskuːlˌmeɪt/
KK: /ˈskuːlˌmeɪt/
A person who is in the same school as another; a fellow student.
I met my schoolmate at the library to study together.
Schoolmate → It is formed from "school" (from Old English *scol*, meaning a place of learning) and "mate" (from Old English *gemetta*, meaning companion or friend). The word "schoolmate" refers to a companion or friend who shares the same school.
Think of a 'place of learning' ('school') where you have a 'companion' ('mate') — that's what a schoolmate is, a friend from school.