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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
With change of suffix, from the Old French adultere (“violation of conjugal faith”) (in Bernard of Clairvaux, Sermons, 12c.), a learnèd borrowing from Latin adulterium, from adulterō. Replaced the older form avoutrie, from the inherited Old French forms avouterie or aoulterie, while keeping its suffix. Compare French adultère (“adultery”). Displaced Old English ǣwbryċe. Not related to adult.
criminal conversation, fornication
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Classic usage
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