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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Latin decennialis, from decennium (“10-year period”) + -ālis, from decennis (“10-year”) + -ium (“-ium”, suffix forming abstract nouns), from decem (“ten”) + annus (“year”) + -is (suffix forming compound adjectives).
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Classic usage
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