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Adverb: longitudinally  ,long-ti'tyoo-di-nu-lee [N. Amer], ,lóng-di'tyoo-di-nu-lee [Brit]
  1. Across time
    "We studied the development of the children longitudinally"
  2. In the direction of the length
    "He cut the paper longitudinally";
    - lengthways, lengthwise, longwise, longways, endlong [archaic]
  3. With respect to longitude
    "longitudinally measured"

Encyclopedia: Longitudinally