*diona*

a. [ F. méridional, L. meridionalis, fr. meridies midday. See Meridian. ] [ 1913 Webster ]

1. Of or pertaining to the meridian. [ 1913 Webster ]

2. Having a southern aspect; southern; southerly. [ 1913 Webster ]

Offices that require heat . . . should be meridional. Sir H. Wotton. [ 1913 Webster ]

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. [ 1913 Webster ]

n. 1. The state of being in the meridian. [ 1913 Webster ]

2. Position in the south; aspect toward the south. [ 1913 Webster ]

adv. In the direction of the meridian. [ 1913 Webster ]