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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Inherited from Middle English equinoctial, equinoccial, equinoxial, from Old French equinoxial, from Latin (circulus) aequinoctiālis, from aequinoctium + -alis.
celestial equator, equinoctial circle, equinoctial line
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Classic usage
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