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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Ancient Greek ὀγδοάς (ogdoás, “eight, a group of eight”). By surface analysis, ogdo- + -ad.
eight, 8, VIII, eighter, eighter from Decatur, octad, octonary, octet
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Classic usage
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