provincialism

noun3

1. •
   The quality of being provincial; having provincial tastes, mentality, manners.

   • The blacksmith's provincialism showed in his speech and manner
2. •
   A word or locution characteristic of a region or district.

   • Prose is allowed less liberty in this respect; but no one nowadays would maintain that the adoption of a provincialism into the literary dialect is absolutely prohibited. — 1875
3. •
   Synonym of regionalism: belief in the superiority of one's regional government; the belief that most or nearly all political power should be decentralized to provincial governments.