Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: longitudo 'length', from longus 'long'

longitude

 noun
     
Related topics: Geography
lon‧gi‧tude [uncountable and countable]
the distance east or west of a particular meridian (=imaginary line along the Earth's surface from the North Pole to the South Pole), measured in degrees [↪ latitude]:
The town lies at longitude 12° east.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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