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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English diafragma, Ancient Greek διάφραγμα (diáphragma, “partition”), from διά (diá, “across”) and φράγμα (phrágma, “barrier”), from the verb φράσσω (phrássō). First attested in the late 14th century.
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Classic usage
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