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Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
From Middle English seventhe, sefte, from Old English seofoþa, from Proto-West Germanic *sebundō, from Proto-Germanic *sebundô. The -n-, lost in northern Proto-West Germanic, was later reinserted by analogy with seven, equivalent to seven + -th.
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Classic usage
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