- distance in degrees east or west of the prime meridian at 0° measured by the angle between the plane of the prime meridian and that of the meridian through the point in question, or by the corresponding time difference
WordReference Random House Learner's Dictionary of American English © 2016
- Geographythe distance east or west on the earth's surface, as measured in degrees from the meridian of some particular place to the prime meridian at Greenwich, England: [uncountable]sixty degrees in longitude.[countable]measuring longitudes.
- Geography, Place Names[Geog.]angular distance east or west on the earth's surface, measured by the angle contained between the meridian of a particular place and some prime meridian, as that of Greenwich, England, and expressed either in degrees or by some corresponding difference in time.
- See celestial longitude.
- See galactic longitude.
- Latin longitūdō length. See longi-, -tude
- Middle English 1350–1400