equinox Meaning in the Cambridge English Dictionary
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Meaning of “equinox” in the English Dictionary

"equinox" in British English

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equinoxnoun [C]

uk   /ˈek.wɪ.nɒks/  us   /-nɑːks/
either of the two ​occasions in the ​year when ​day and ​night are of ​equallength: the vernal/​autumn equinox
(Definition of equinox from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"equinox" in American English

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equinoxnoun [C]

 us   /ˈi·kwəˌnɑks, ˈek·wə-/
either of the two ​times during the ​year when the ​sun crosses the ​equator and ​day and ​night are of ​equallength, about ​March 21st and ​September 23rd
(Definition of equinox from the Cambridge Academic Content Dictionary © Cambridge University Press)
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