Meridional \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.

Source: Webster's Revised Unabridged Dictionary (1913)