equinox

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equinox /ˈiːkwəˌnɑːks/ /ˈɛkwəˌnɑːks/ noun
plural equinoxes
equinox
/ˈiːkwəˌnɑːks/ /ˈɛkwəˌnɑːks/
noun
plural equinoxes
Learner's definition of EQUINOX
[count]
: a day when day and night are the same length
◊ There are two equinoxes in the year: the spring (or vernal ) equinox, which occurs around March 21, and the autumn (or autumnal ) equinox, which occurs around September 23.
compare solstice
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