aeon vs eternity

aeon

noun
  • Each universe in a series of universes, according to conformal cyclic cosmology. 

  • A spirit being emanating from the Godhead. 

eternity

noun
  • A period of time which extends infinitely far into the future. 

  • Existence without end, infinite time. 

  • The remainder of time that elapses after death. 

  • Existence outside of time. 

  • A comparatively long time. 

How often have the words aeon and eternity occurred in a corpus of books? (source: Google Ngram Viewer )