from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Angular distance on the earth's surface, measured east or west from the prime meridian at Greenwich, England, to the meridian passing through a position, expressed in degrees (or hours), minutes, and seconds.
- n. Celestial longitude.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Angular distance measured west or east of the prime meridian.
- n. Any imaginary line perpendicular to the equator and part of a great circle passing through the North Pole and South Pole.
- n. Length.
from the GNU version of the Collaborative International Dictionary of English
- n. Length; measure or distance along the longest line; -- distinguished from
breadthor thickness; ; rare now, except in a humorous sense.
- 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
- 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.
from The Century Dictionary and Cyclopedia
- n. Length; measure along the longest line.
- n. In geography, the angle at the pole contained between two meridians, one of which, called the first or prime meridian, passes through some conventional point from which the angle is measured.
- n. In astronomy, the arc of the ecliptic measured eastward from the vernal equinoctial point to the foot of the circle of latitude drawn through the object, as a star or other point on the sphere whose position is in question. See circle of latitudes, under circle.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the angular distance between a point on any meridian and the prime meridian at Greenwich
Middle English, length, a measured length, from Old French, from Latin longitūdō, longitūdin-, from longus, long.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from Latin longitūdō ("length, a measured length"), from longus ("long"). (Wiktionary)