atra-in this Manu's reign; api-certainly; bhagavat-janma-appearance of the Supreme Personality of Godhead; kasyapat-by Kasyapa Muni; aditeh-of mother Aditi; abhut-became possible; adityanam-of the Adityas; avara-jah-the youngest; visnuh-Lord Visnu Himself; vamana-rupa-dhrk-appearing as Lord Vamana.