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Äon

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18th century, from Latin aeōn (“age, eternity”), from Ancient Greek αἰών (aiṓn, “age, eternity”), from Proto-Indo-European *h₂eyu- (“vital force, life, long life, eternity”).

• IPA^(key): /ɛˈoːn/, [ʔɛˈoːn], [ʔe-], [-ˈʔoːn]
• IPA^(key): /ˈɛːɔn/, [ˈʔɛː.ɔn], [ˈʔeː.ɔn]

Äon m or n (mixed, genitive Äons, plural Äonen)

1. (learned) aeon, eon (exceedingly long period of time)

• “Äon” in Duden online