Sermon- The religious preachings made with the purpose of refutation of wrong path, expellation of doubt and elucidation of hitherto unknown topics.
unmārganivartanārthaṃ saṃdehavyāvarttanāpūrvapadārthaprakāśanārthaṃ dharmakathādyanuṣṭhānaṃ dharmopadeśa ityākhyāyate.
(TaVā 9.25)