a word, phrase, or expression that is characteristic to the language/dialect of a particular region;
e.g. A movie's dialogue is the perfect place to encounter a provincialism you've never heard before.
(noun)
the state or quality of being narrow-minded and/or unsophisticated and having a mindset and way of life usually associated with regions outside of a country's capital city;
e.g. They looked down on her provincialism and limited experience.