eonian adj 1: of or relating to a geological eon (longer than an era) [syn: {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" [syn: {ageless}, {aeonian}, {eonian}, {eternal}, {everlasting}, {perpetual}, {unending}, {unceasing}]