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Adjective: longitudinal  `lón-ji't(y)oo-d(u-)nul [N. Amer], `lón-di't(y)oo-di-nul or `lóng-ji't(y)oo-di-nul [Brit]
  1. Of or relating to lines of longitude
    "longitudinal reckoning by the navigator"
     
  2. Running lengthwise
    "a thin longitudinal strip"; "longitudinal measurements of the hull"
     
  3. Over an extended time
    "a longitudinal study of twins"

See also: lengthways, lengthwise, long, longitude, longitudinally

Encyclopedia: Longitudinal