me·rid·i·o·nal (m?-r?d??-?-n?l)adj.1. Of or relating to meridians or a meridian.2. Located in the south; southern.3. Of or characteristic of southern areas or people.n. An inhabitant of a southern region, especially the south of France.[Middle English, pertaining to the sun’s position at noon, from Old French meridionel, southern, from Late Latin mer?di?n?lis, from Latin mer?di?nus, of midday, southern; see meridian.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.meridional (m??r?d??n?l) adj1. (Physical Geography) along, relating to, or resembling a meridian2. (Physical Geography) characteristic of or located in the south, esp of Europen (Peoples) an inhabitant of the south, esp of France[C14: from Late Latin mer?di?n?lis southern; see meridian; for form, compare septentri?n?lis septentrional] me?ridionally advCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014me?rid?i?o?nal (m??r?d i ? nl) adj. 1. of, pertaining to, or resembling a meridian. 2. characteristic of the south or of people inhabiting the south, esp. of France. 3. southern; southerly. n. 4. an inhabitant of the south, esp. the south of France. [1350?1400; Middle English