Meaning of “equinox” in the English Dictionary

british dictionary

"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 equal length, about March 21st and September 23rd

(Definition of “equinox” from the Cambridge Academic Content Dictionary © Cambridge University Press)