Etymology
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longitude (n.)

late 14c., "length; height," also "astronomical or geographic longitude," a measure of the east-west distance of the dome of the sky or the surface of the earth, from Latin longitudo "length, long duration," from longus "long" (see long (adj.)). For explanation of the geographical sense, see latitude.

updated on August 19, 2016

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Definitions of longitude from WordNet

longitude (n.)
the angular distance between a point on any meridian and the prime meridian at Greenwich;
From wordnet.princeton.edu, not affiliated with etymonline.