Breadcrumb Home > Dictionary > Index E equinox: Meaning and Definition of Find definitions for: e•qui•nox Pronunciation: (ē'kwu-noks", ek'wu-), [key] — n. the 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 21and September 22 either of the equinoctial points. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: equinox (Thesaurus) equinoctial year equi NP deletion TrendingHere are the facts and trivia that people are buzzing about. Who's Who in the "Lord of the Rings" Roman Catholic Church Hierarchy Current Events This Week: March 2023 42 Top Western Movie Quotes Slaves in the Family User's Guide to Environmental Language ✖ Related Content Daily Word Quiz: plaudit Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language