“rolling on or forward” (opp. vivaṭṭa “rolling back”), with ref. to the development of the Universe & time (kappa) the ascending aeon (vivaṭṭa the descending cycle), evolution Iti.99; Pp.60; Vism.419; Sdhp.484, Sdhp.485. -vivaṭṭa a period within which evolution & dissolution of the world takes place, a complete world-cycle (see also; vivaṭṭa DN.i.14; AN.ii.142; Iti.15, Iti.99; Pp.60.)

saṃ + vaṭṭa¹