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WordReference Random House Unabridged Dictionary of American English © 2024autum′nal e′quinox, - AstronomySee under equinox (def. 1).
- AstronomyAlso called autum′nal point′. the position of the sun at the time of the autumnal equinox.
WordReference Random House Learner's Dictionary of American English © 2024e•qui•nox /ˈikwəˌnɑks, ˈɛkwə-/USA pronunciation n. [countable]- Astronomyone of the times when the sun crosses the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 and September 22.
See -equa-, -noc-. WordReference Random House Unabridged Dictionary of American English © 2024e•qui•nox (ē′kwə noks′, ek′wə-),USA pronunciation n. - Astronomythe time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September 22 (autumnal equinox).
- Astronomyeither of the equinoctial points.
- Medieval Latin equinoxium, for Latin aequinoctium the time of equal days and nights (aequi- equi- + noct- (stem of nox) night + -ium -ium)
- Middle English 1350–1400
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