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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Named after Charles Boyle, 4th Earl of Orrery (1676–1731), for whom such a device was made. The placename is from Irish Orbhraighe, originally the name of a tribe (Orbh-raighe (“Orb's people”)), and then of a territory and a barony.
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Classic usage
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