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English definition of “equinox”

equinox

noun [C]     /ˈek.wɪ.nɒks/ US  /-nɑːks/
either of the two occasions in the year when day and night are of equal length: the vernal/autumn equinoxAstronomy - general words
(Definition of equinox noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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