located in the south, southern; later especially, often pertaining to the southern parts of Europe.

an inhabitant of a southern region, especially the south of France

plural of meridional

In a meridional manner / With regard to, or in the direction of a meridian

The state of being in the meridian. / Position in the south; aspect toward the south.

(biology) The movement of fish to warmer, more southern waters

(optics) A ray that passes through the axis of the optical fiber.

(meteorology) The component of a wind along a particular meridian

plural of meridional ray

plural of meridional wind