aeonian in WordNet English dictionary

1. of or relating to a geological eon (longer than an era)
   eonian  aeonian 
   
2. continuing forever or indefinitely
   "the ageless themes of love and revenge"; "eternal truths"; "life everlasting"; "hell's perpetual fires"; "the unending bliss of heaven"
   ageless  aeonian  eonian  eternal  everlasting  perpetual  unending  unceasing