Definition: a very scholarly commentary on Patanjali's MahabhaSya written by Kaiyatabhatta in the eleventh century, The commentary has so nicely explained every difficult and obscure point in the Mahabhasya, and has so thoroughly explained each sentence that the remark of later grammarians that the torch of the Mahabhasya has been kept burning by the Pradipa appears quite apt and justified. Kaiyata's commentary has thrown much additional light on the original arguments and statements in the Mahabhasya. There is a learned commentary on the Pradipa written by Nagesabhatta which is named vivarana by the author but which is well known by the name 'Uddyota' among students and teachers of Vyakarana. For details see pp. 389, 390 Vol VII, Patanjala Mahabhasya, D. E. Society's Edition.