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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Germanic roots meaning "play". In the biology sense, it comes specifically from Swedish lek (“child's play”), by means of Swedish leka (“to play”). The verb is first attested in English in 1871 and the noun at least as early as 1867.
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Classic usage
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