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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Medieval Latin, from Ancient Greek ἕν (hén), stem of εἷς (heîs, “one”) + διά (diá, “through”) + δύο (dúo, “two”), “one [idea] through two [words]”.
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Classic usage
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