Manvantaram means the reign of Manu, during which six types of persons carry out specific duties: the ruling Manu, the devatās, the sons of Manu, Indra, the great sages and the incarnations of the Supreme Lord. Previously manvantarāṇi was defined as sad-dharma. Here manvantaram is described. The word vidhā means “the persons like Manu who perform their duties.” This takes six forms. Manvantara means “the period in which these six types of persons carry out their designated jobs.”