Etymology
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longitudinal (adj.)

late 14c., from Medieval Latin longitudinalis, from Latin longitudo (see longitude).

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Definitions of longitudinal

longitudinal (adj.)
of or relating to lines of longitude;
longitudinal reckoning by the navigator
longitudinal (adj.)
running lengthwise;
longitudinal measurements of the hull
a thin longitudinal strip
longitudinal (adj.)
over an extended time;
a longitudinal study of twins
From wordnet.princeton.edu