Me*rid"i*o*nal (?), a. [F. m'eridional, L. meridionalis, fr. meridies midday. See Meridian.]
Of or pertaining to the meridian.
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.
© Webster 1913.