Longitude

Longitude - A measure of distance east and west of the Greenwich (England) Meridian (Greenwich was the site of the original Royal Observatory), also called the Prime Meridian -- a north/south line, considered Zero degrees, 0-. Points around the globe are measured as degrees east and west of the Prime Meridian, up to 180- East or West, where a meridian, very roughly along the International Date Line, bisects the Pacific Ocean. See: LATITUDE.

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Source: Postcom, 16 March 2010 09:05:21, http://postcom.org/public/admail_image/glossary.htm

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longitude - [coordinate systems] The angular distance, usually expressed in degrees, minutes, and seconds, of the location of a point on the earth's surface east or west of an arbitrarily defined meridian (usually the Greenwich prime meridian). All lines of longitude are great circles that intersect the equator and pass through the North and South Poles. 

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Source: esri, 02 June 2012 09:09:10, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation