longitudinal longitudinal /ˌlɑːndʒəˈtuːdənəl/

adjective

1. Over an extended time  ( longitudinal )
   over an extended time
    A longitudinal study of twins
   a longitudinal study of twins
   
2. Running lengthwise  ( longitudinal )
   running lengthwise
    A thin longitudinal strip
   a thin longitudinal strip
    Longitudinal measurements of the hull
   longitudinal measurements of the hull
   
3. Of or relating to lines of longitude  ( longitudinal )
   of or relating to lines of longitude
    Longitudinal reckoning by the navigator
   longitudinal reckoning by the navigator