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lon·gi·tu·di·nal (lŏn'jĭ-tūd'n-əl, -tyūd'-, lôn'-)
adj.
    1. Of or relating to longitude or length: a longitudinal reckoning by the navigator; made longitudinal measurements of the hull.
    2. Concerned with the development of persons or groups over time: a longitudinal study of twins.
  2. Placed or running lengthwise: longitudinal stripes.
longitudinally lon'gi·tu'di·nal·ly adv.

logo The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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