NOUN (3)

1. a feature (as a pronunciation or expression or custom) that is characteristic of a particular region;

2. a foreign policy that defines the international interests of a country in terms of particular geographic areas;

3. loyalty to the interests of a particular region;

WordNet (r) 3.0 (2006):

regionalism
    n 1: a feature (as a pronunciation or expression or custom) that
         is characteristic of a particular region
    2: a foreign policy that defines the international interests of
       a country in terms of particular geographic areas
    3: loyalty to the interests of a particular region