American Heritage® Dictionary of the English Language, Fourth Edition
- n. Either of two points on the celestial sphere at which the ecliptic intersects the celestial equator.
- n. Either of the two times during a year when the sun crosses the celestial equator and when the length of day and night are approximately equal; the vernal equinox or the autumnal equinox.
Century Dictionary and Cyclopedia
- n. The moment when the sun crosses the plane of the earth's equator, making the day and night everywhere of equal length (whence the name). There are two annual equinoxes, the vernal, which falls in the spring, namely, on the 21st of March according to the Gregorian calendar, and the autumnal, which falls in the autumn, namely, on the 22d of September. The term equinox is also loosely applied to the equinoctial points (which see, under equinoctial).
- n. An equinoctial gale or storm; an equinoctial.
- n. Anything equal; an equal measure.
GNU Webster's 1913
- n. The time when the sun enters one of the equinoctial points, that is, about March 21 and September 22. See Autumnal equinox, Vernal equinox, under autumnal and vernal.
- n. rare Equinoctial wind or storm.
- n. (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
- n. either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
- From Latin aequinoctium, from aequus ("equal") + nox ("night"). (Wiktionary)
- Middle English, from Old French equinoxe, from Medieval Latin aequinoxium, from Latin aequinoctium : aequi-, equi- + nox, noct-, night. (American Heritage® Dictionary of the English Language, Fourth Edition)
“The word equinox comes from the Latin words for "equal" and "night.”
“Instead of Summer and Winter Solstice, it should be Periuma and Apuma, and without an axial tilt the term equinox is moot -- every day is equal amounts of day and night.”
“The Truth: The vernal equinox is one of two days each year when the length of day and night are the same (about 12 hours each).”
“Spring equinox is upon us again, so it's time for the annual "Cumbre Tajín" festival, which will run from the 19th thru the 23rd of March.”
“Placing Easter near the vernal equinox is good symbolism.”
“The day of the spring equinox is supposed to be the best day to climb to the top of any pyramid to renew your energy.”
“The somnolent gloom thrown by the massed foliage gives majesty to the summer field; and how splendid, on some loud day in the equinox, is the sight of the dumb shadows of the shouting, gesticulating trees, tossing and bending, lengthening and shrinking over the land.”
“The word equinox implies the condition that the night is equal to the day.”
“The official church date for the equinox is March 21, but as the Eastern Orthodox use the Julian calendar while Western churches use the Gregorian, both of which designate March 21 as the equinox, the actual date of Easter ranges from March 22 to April 15.”
“These colors are connected to the fall equinox, which is around the 20th or 21st of September each year and is sometimes called “Mabon.””
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