\Me*rid"i*o*nal\, a. [F. m['e]ridional, L.
meridionalis, fr. meridies midday. See {Meridian}.]
1. Of or pertaining to the meridian.
2. Having a southern aspect; southern; southerly.
         Offices that require heat . . . should be
         meridional.                           --Sir H.
                                               Wotton.
{Meridional distance}, the distance or departure from the
   meridian; the easting or westing.
{Meridional parts}, parts of the meridian in Mercator's
   projection, corresponding to each minute of latitude from
   the equator up to 70 or 80 degrees; tabulated numbers
   representing these parts used in projecting charts, and in
   solving cases in Mercator's sailing.