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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
From Middle English authentik, from Old French autentique, from Latin authenticus, from Ancient Greek αὐθεντικός (authentikós, “authentic, genuine”), from Ancient Greek αὐθέντης (authéntēs, “perpetrator, murderer, absolute ruler”). Doublet of effendi.
reliable
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Classic usage
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