Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
eonian is an adjective meaning "of or relating to a geological eon (longer than an era)". It carries 2 recorded senses.
of or relating to a geological eon (longer than an era)
continuing forever or indefinitely
“the ageless themes of love and revenge”
“eternal truths”
“life everlasting”
“hell's perpetual fires”
“the unending bliss of heaven”
Definitions, synonyms and semantic relations for eonian come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.