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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English defaut, defaute, from Old French defaute (“fault, defect, failure, culpability, lack”), ultimately from Latin de- (“away”) + fallo (“deceive, cheat, escape notice of”).
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Classic usage
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