one of the two times in the year (around 20 March and 22 September) when the sun is above the equator and day and night are of equal length 二分时刻;昼夜平分时;春分;秋分 the spring/autumn equinox 春分;秋分
Oxford Collocations DictionaryEquinox is used after these nouns:- autumn
- fall
- spring
- …
Word Originlate Middle English: from Old French equinoxe or Latin aequinoctium, from aequi- ‘equal’ + nox, noct- ‘night’.