Here's a breakdown:
* Formal: It's the formal term for "teacher" in Thai.
* Respectful: It shows respect and deference to the person being addressed.
* Broad scope: It can be used for teachers in schools, universities, and even for mentors in various fields.
Examples:
* Ajarn Somchai (อาจารย์ สมชาย) - Professor Somchai
* Ajarn Khunying (อาจารย์ คุณหญิง) - Teacher (female) with a noble title
* Ajarn Nual (อาจารย์ นวล) - Teacher (female)
You'll often see "Ajarn" used in front of someone's name as a title. It's important to use this term when addressing teachers and professors in Thailand as a sign of respect.