IPA: //ˈpleɪˌmeɪt//
KK: /ˈpleɪˌmeɪt/
A person, usually a child, who plays with another child.
She invited her best friend to be her playmate at the park.
Playmate → It is formed from "play" (from Old English *plega*, meaning to engage in activity for enjoyment) and "mate" (from Old English *gemetta*, meaning companion or friend). The word "playmate" refers to a companion with whom one engages in play or enjoyable activities.
Think of someone you enjoy engaging in activities with — that's a playmate, a friend you play with.