Definition of meridionally in English:

meridionally

Pronunciation /mɪˈrɪdɪənəli/ /mɪˈrɪdɪən(ə)li/

adverb

  • Along a meridian or meridians; in a north–south direction.

Origin

Late 16th century; earliest use found in Robert Norman (fl. 1560–1584), maker of mathematical instruments. From meridional + -ly.