* Adjective: This is the most common usage, meaning "relating to or characteristic of a province," or "narrow-minded or unsophisticated." For example: "She had a provincial attitude towards art."
* Noun: This usage refers to someone who is from a province or is characterized by provincial qualities. For example: "He was considered a provincial by the city dwellers."
* Adverb: This usage is less common, but possible, meaning "in a provincial manner." For example: "They lived provincially in a small town."
Therefore, the specific part of speech for "provincial" depends on the context of its use.