Manvantara

A manvantara, in Hindu cosmology, is a cyclic period of time identifying the duration, reign, or age of a Manu, the progenitor of mankind.

'interval, period, or term'), creating manu-antara or manvantara, literally meaning "the duration of a Manu", or his lifespan, with synonym meanings of "the interval, reign, period, or age of a Manu".

1:[9] (67) A year is a day and a night of the gods ... (79) The before-mentioned age of the gods, (or) twelve thousand (of their years), being multiplied by seventy-one, (constitutes what) is here named the period of a Manu (Manvantara).

(80) The Manvantaras, the creations and destructions (of the world, are) numberless; sporting, as it were, Brahman [(Brahma)] repeats this again and again.Surya Siddhanta, Ch.

3:[11] Twelve thousand divine years, each composed of (three hundred and sixty) such days, constitute the period of the four Yugas, or ages ... a thousand such aggregates are a day of Brahma, and fourteen Manus reign within that term ...