Longitude definitions

lŏn'jĭ-to͝od', -tyo͝od', lôn'-
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.
noun
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Length.
noun
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Celestial longitude.
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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.
noun
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A measure of relative position east or west on the Earth's surface, given in degrees from a certain meridian, usually the prime meridian at Greenwich, England, which has a longitude of 0°. The distance of a degree of longitude is about 69 statute miles or 60 nautical miles (111 km) at the equator, decreasing to zero at the poles. Longitude and latitude are the coordinates used to identify any point on the Earth's surface.
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Celestial longitude.
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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.

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.

noun
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The east/west location on earth. For details of latitude/longitude positioning, see latitude.
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Angular distance measured west or east of the prime meridian.
noun
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Any imaginary line perpendicular to the equator and part of a great circle passing through the North Pole and South Pole.
noun
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(archaic) Length.
noun
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Origin of longitude

Middle English length, a measured length from Old French from Latin longitūdō longitūdin- from longus long del-1 in Indo-European roots