regional Definition

affecting a particular region : localized

of, relating to, characteristic of, or serving a region

marked by regionalism

something (such as a branch of an organization or an edition of a magazine) that serves a region

on a regional basis

a condition of chronic, severe, often burning pain usually of part or all of one or more extremities that typically occurs following an injury, that is often accompanied by swelling, skin discoloration, allodynia, abnormal sweating, and impaired motor function in the affected area, and that is of unknown pathogenesis —abbreviation CRPS

occurring between, or existing between two or more regions