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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Origin unclear. One theory is that it originates from the word duly, as in “duly appointed [a cadet]” (part of the official acceptance). Another claims that the term is derived from Ancient Greek δοῦλος (doûlos, “slave”) + -ie. Apparently dates to the first class of the Academy, in 1955.
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tap / space
Classic usage
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