WordReference Random House Learner's Dictionary of American English © 2014
lon•gi•tude /ˈlɑndʒɪˌtud, -ˌtyud/USA pronunciation  n. 

    the 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.


Collins Concise English Dictionary © HarperCollins Publishers::

longitude /ˈlɒndʒɪˌtjuːd ˈlɒŋɡ-/ n
  1. 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
    See latitude
Etymology: 14th Century: from Latin longitūdō length, from longus long1



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