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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English twifold, twifald, from Old English twifeald (“double, twofold”), from Proto-West Germanic *twifald, from Proto-Germanic *twifaldaz (“twofold”), equivalent to twi- + -fold. Cognate with Middle High German zwivalt (“double”), Old Norse tvífaldr (“double”), Icelandic tvöfaldur (“double”).
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Classic usage
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