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The definition of longitude is the distance on the Earth's surface between a specific point and the prime meridian in Greenwich England, measured as a degree or the difference in time from the prime meridian.

(noun)

An example of longitude is that New York City is at 74° degrees west and local time is 5 hours less than Greenwich mean time.

See longitude in Webster's New World College Dictionary

noun

length
distance east or west on the earth's surface, measured as an arc of the equator (in degrees up to 180° or by the difference in time) between the meridian passing through a particular place and a standard or prime meridian, usually the one passing through Greenwich, England
Astron.

Origin: ME < L longitudo < longus, long

See longitude in American Heritage Dictionary 4

noun

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.
Celestial longitude.

Origin:

Origin: Middle English, length, a measured length

Origin: , from Old French

Origin: , from Latin longitūdō, longitūdin-

Origin: , from longus, long; see del-¹ in Indo-European roots

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