In geography, it has two ways: the process of delineating the Earth, its small areas or other units into regions and a state of such a delineation.
In globalisation discourse, it represents a world that becomes less interconnected, with a stronger regional focus.
In politics, it is the process of dividing a political entity or country into smaller jurisdictions (administrative divisions or subnational units) and transferring power from the central government to the regions; the opposite of unitarisation. See Regionalism (politics).
In sport, it is when a team has multiple "home" venues in different cities. Examples of regionalized teams include a few teams in the defunct American Basketball Association, or the Green Bay Packers when they played in both Green Bay and Milwaukee from 1933 to 1994.