Playmate

wiktionary

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From play +‎ mate. Compare earlier playfeer(“playmate”) of similar construction.

etymonline

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playmate (n.)

1640s, "companion in play or amusement, playfellow," from play (v.) + mate (n.). The sexual sense is from 1954 and the launch of "Playboy" magazine. The earlier word was Middle English playfere (also playfeer, playpheer) with obsolete fere "companion."