Equinox E"qui*nox, n. [OE. equinoxium, equenoxium, L. aequinoctium; aequus equal + nox, noctis, night: cf. F. ['e]quinoxe. See {Equal}, and {Night}.] 1. 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}. [1913 Webster]

When descends on the Atlantic The gigantic Stormwind of the equinox. --Longfellow. [1913 Webster]

2. Equinoctial wind or storm. [R.] --Dryden. [1913 Webster]

The Collaborative International Dictionary of English. 2000.