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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
From Middle English chaufen (“to warm”), borrowed from Old French chaufer (modern French chauffer), from Latin calefacere, calfacere (“to make warm”), from calere (“to be warm”) + facere (“to make”). See caldron.
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Classic usage
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