One of two great schools of Buddhist doctrine emphasizing personal salvation through your own efforts; a conservative form of Buddhism that adheres to Pali scriptures and the non-theistic ideal of self purification to nirvana; the dominant religion of Sri Lanka (Ceylon) and Myanmar (Burma) and Thailand and Laos and Cambodia WordNet 3.0 & Open English WordNet

Theravāda is the most commonly accepted name of Buddhism's oldest existing school. Wikipedia

Major branch of Buddhism following the Pāli Canon, dominant in Sri Lanka, Cambodia, Laos, Myanmar and Thailand Wikidata

A sect of Buddhism, whose teachings are based on Buddha's scriptures in the Pali canon, widely practised in Southeast Asia, mainly in Sri Lanka, Thailand, Laos and Cambodia. It tends to be conservative in contrast to the more liberal Mahayana, rejects the existence of gods, and teaches non-universal salvation. Wiktionary

School of Buddhism. Wiktionary (translation)