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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Ancient Greek ἐννεάς (enneás), ἐννεάδος (enneádos, “body of nine”) + -ad (suffix designating a unit); analysable as ennea- + -ad. The Greek words ἐννεάς and ἐννεάδος are derived from ἐννέᾰ (ennéă, “nine”) (ultimately from Proto-Indo-European *h₁néwn̥ (“nine”)) + -ᾰ́ς (-ắs, suffix forming abstract nouns of number from numerals) or -ος (-os).
nine, 9, IX, niner, Nina from Carolina
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Classic usage
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