Manvantara (Sanskrit) [from
manu +
antara between] Between two manus; a period of activity or manifestation. Manu is the entities collectively aggregated into a unity which appear first at the beginning of manifestation and from which, like a cosmic tree, everything is derived or born. A manvantara, therefore, is the period of activity between any two manus, on any plane, since in any such period there is a root-manu at the beginning of evolution and a seed-manu at its close, preceding a pralaya.
One has to gather from context what the meaning of the manvantara referred to is, remembering that what is applicable to a lesser period applied also to a greater, and conversely. When speaking of a manvantara of our planet, a period of one round of the planetary chain is usually meant. There is also the manvantara of any globe of the planetary chain. Seven rounds of the planetary chain make a mahamanvantara of a planet, a Day of Brahma. A solar manvantara is a period of seven Days of Brahma. The Life of Brahma is a mahamanvantara or mahakalpa of the solar system. A minor or globe manvantara is the duration of the seven root-races on any particular globe of the planetary chain. Even a root-race is sometimes called a manvantara because there is a root-manu and seed-manu to each race. The period of a human life is sometimes called a paurusha manvantara; the period of a planet's life, a bhaumika manvantara; the life period of the solar system, a saurya manvantara, the life period of the universe, a prakritika manvantara, which last can become synonymous with the saurya manvantara.
When the time arrives for the re-opening of a planetary manvantara, the planet
to be continue "
Manvantara2 "