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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English ost, from Old English āst (“a kiln”), from Proto-Germanic *aistaz (“kiln”), from *aisǭ (“fire”), from Proto-Indo-European *h₂eydʰ- (“to burn; fire”). Cognate with Dutch eest (“kiln”), Middle Low German eiste (“kiln”), Latin aedes (“house; hearth”), Old English ād (“fire; funeral pyre”).
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Classic usage
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