2. Proper noun. The ethnic Lao who have traditionally lived in Isan. ¹
3. Proper noun. The language of the Isan people (between Lao and Thai, and sometimes considered a dialect of Lao, although it is written in Thai script). ¹
4. Adjective. Of, from, or pertaining to '''Isan''', the '''Isan''' people or the '''Isan''' language. ¹
¹ Source: wiktionary.com