Longman Dictionary of Contemporary English homepage

Topic: ASTRONOMY

Date: 1300-1400
Language: French
Origin: équinoxe, from Latin aequinoctium, from aequi- ( EQUI-) + nox 'night'

equinox

 noun
     
eq‧ui‧nox [countable]
HEG one of the two times in a year when night and day are of equal length:
the spring equinox
Definition of equinox from the Longman Dictionary of Contemporary English within
the topic ASTRONOMY
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