- (n.) The arc or portion of the equator intersected between the meridian of a given place and the meridian of some other place from which longitude is reckoned, as from Greenwich, England or sometimes from the capital of a country, as from Washington or Paris. The longitude of a place is expressed either in degrees or in time; as, that of New York is 74¡ or 4 h. 56 min. west of Greenwich.
- (n.) Length; measure or distance along the longest line; -- distinguished from breadth or thickness; as, the longitude of a room; rare now, except in a humorous sense.
- (n.) The distance in degrees, reckoned from the vernal equinox, on the ecliptic, to a circle at right angles to the ecliptic passing through the heavenly body whose longitude is designated; as, the longitude of Capella is 79¡.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). longitude. Retrieved September 20, 2026, from http://smartdefine.org/longitude/definitions/2028783 |
| Chicago | Webster's. 2011. "longitude" http://smartdefine.org/longitude/definitions/2028783 (accessed September 20, 2026). |
| Harvard | Webster's 2011, longitude, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/longitude/definitions/2028783>. |
| MLA | Webster's. "longitude" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/longitude/definitions/2028783> |