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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Late Latin superērogātiō (“payment in addition”), from superērogāre (“to pay in addition”), from super (“in addition to”) + ērogāre (“to pay, pay out, expend, disburse”), equivalent to supererogate + -ion.
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Classic usage
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