aeviternity vs aevum

aeviternity

noun
  • Synonym of aevum (“the temporal mode of existence between time and eternity, said to be experienced by angels, saints, and celestial bodies (which medieval astronomy believed to be unchanging)”) 

  • Synonym of eternity (“existence without end”) 

aevum

noun
  • The temporal mode of existence between time and eternity, said to be experienced by angels, saints, and celestial bodies (which medieval astronomy believed to be unchanging. 

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