Ajahn

Ajahn (Thai: อาจารย์, RTGS: achan, IPA: [ʔāː.tɕāːn]; Lao: ອາຈານ, romanized: ācān) is a Thai- and Lao-derived term that translates as "professor" or "teacher".

The term is in turn derived from the Pali word ācariya and is a term of respect, similar in meaning to the Japanese sensei.

It is used as a title of address for high school and university teachers, and for Buddhist monks who have passed ten vassa – in other words those who have maintained their monastic precepts unbroken for a period of ten years.

The term Luang Por, "Venerable father", signifies an ajahn of acknowledged seniority in Thai Buddhism.

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