IPA: /ˈklʌbˌmeɪt/
KK: /klʌbmeɪt/
A person who belongs to the same club as someone else.
My clubmate and I worked together on the project.
Clubmate → It is formed from "club" (from Old French *clube*, meaning a group or gathering) and "mate" (from Old English *gemetta*, meaning a companion or friend). The word "clubmate" refers to a companion or friend within a club or group.
Think of a 'club' as a gathering of people and 'mate' as a friend — a clubmate is simply a friend you have in that gathering.