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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English lune, borrowed from Old Norse logn (“windstillness”), from Proto-Norse *lugna, meaning "place where the water is smooth", ultimately from Proto-Indo-European *lewk- (“bright”), referring to shining water. Germanic cognates include Icelandic lón, Danish lyn (“lightning”), Swedish lugn (“calm water”).
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Classic usage
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