- (a.) Pertaining to the time when the sun enters the equinoctial points; as, an equinoctial gale or storm, that is, one happening at or near the time of the equinox, in any part of the world.
- (a.) Pertaining to an equinox or the equinoxes or to the time of equal day and night; as, the equinoctial line.
- (a.) Pertaining to the regions or climate of the equinoctial line or equator; in or near that line; as, equinoctial heat; an equinoctial sun.
- (n.) The equinoctial line.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). equinoctial. Retrieved September 26, 2026, from http://smartdefine.org/equinoctial/definitions/2004424 |
| Chicago | Webster's. 2011. "equinoctial" http://smartdefine.org/equinoctial/definitions/2004424 (accessed September 26, 2026). |
| Harvard | Webster's 2011, equinoctial, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/equinoctial/definitions/2004424>. |
| MLA | Webster's. "equinoctial" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/equinoctial/definitions/2004424> |