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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from Spanish bonanza (“dead calm, fair weather, good luck, rich lode”), from Vulgar Latin *bonacia (“lull, dead calm”), in turn from Latin malacia (“calm sea”), influenced by bonus (“good”) under the false impression that initial mal- is a derivate of malus (“bad”).
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Classic usage
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