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Adjective: longitudinal  ,lón-ji't(y)oo-d(u-)nul [N. Amer], ,lón-di'tyoo-di-nul or ,lóng-ji'tyoo-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

Encyclopedia: Longitudinal