American English

Definition of equinox noun from the Oxford Advanced American Dictionary

 

equinox

 noun
noun
NAmE//ˈikwəˌnɑks//
 
, NAmE//ˈɛkwəˌnɑks//
 
 
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one of the two times in the year (around March 20 and September 22) when the sun is above the equator and day and night are of equal length the spring/fall equinox
See the Oxford Advanced Learner's Dictionary entry: equinox