Princeton's WordNet

1. playmate, playfellow(noun)

   a companion at play

Kernerman English Learner's Dictionary

1. playmate(noun)ˈpleɪˌmeɪt

   a child who plays with another child

   He has lots of playmates at the kindergarten.

Wiktionary

1. playmate(Noun)

   A companion for someone (especially a child) to play with.

2. playmate(Noun)

   A female who has appeared in Playboy magazine.

Webster Dictionary

1. Playmate(noun)

   a companion in diversions; a playfellow

• speelmaatAfrikaans
• زَميل اللعبArabic
• другар от детинствоBulgarian
• companheiroPortuguese (BR)
• kamarádCzech
• der/die Spielkamerad(in)German
• legekammeratDanish
• φίλος από τα παιδικά χρόνιαGreek
• compañero de juegosSpanish
• mängukaaslaneEstonian
• همبازیFarsi
• leikkikaveriFinnish
• (petit(e)) camaradeFrench
• חָבֵר לְמִשחָקHebrew
• बचपन का दोस्तHindi
• drug u igriCroatian
• játszótársHungarian
• teman mainIndonesian
• leikfélagiIcelandic
• compagno (gi giochi)Italian
• 遊び友達Japanese
• 놀이 친구Korean
• vaikystės draugasLithuanian
• bērnības draugs; rotaļbiedrsLatvian
• rakan sepermainanMalay
• speelmakkerDutch
• lekekameratNorwegian
• towarzysz zabawPolish
• رفيق پارتنر بازىPersian
• د لوبه ملګرىPashto
• companheiroPortuguese
• tovarăş de joacăRomanian
• друг детстваRussian
• kamarátSlovak
• prijatelj iz otroštvaSlovenian
• drug za igruSerbian
• lekkamratSwedish
• เพื่อนคู่หูThai
• oyun arkadaşıTurkish
• 兒童時期玩耍的伙伴Chinese (Trad.)
• друг дитинстваUkrainian
• لنگوٹيا يار، ہمجوليUrdu
• bạn cùng chơiVietnamese
• 儿童时期玩耍的伙伴Chinese (Simp.)