Thayer's Greek Lexicon

 1. new birth, reproduction, renewal, recreation, regeneration
  1) hence renovation, regeneration, the production of a new life
consecrated to God, a radical change of mind for the better.
The word often used to denote the restoration of a thing to
its pristine state, its renovation, as a renewal or
restoration of life after death
  2) the renovation of the earth after the deluge
  3) the renewal of the world to take place after its destruction
by fire, as the Stoics taught
  4) the signal and glorious change of all things (in heaven and
earth) for the better, that restoration of the primal and
perfect condition of things which existed before the fall of
our first parents, which the Jews looked for in connection
with the advent of the Messiah, and which Christians expected
in connection with the visible return of Jesus from heaven.
  5) other uses
1e1. of Cicero's restoration to rank and fortune on his recall
from exile
1e2. of the restoration of the Jewish nation after exile
1e3. of the recovery of knowledge by recollection