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aeonian

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adjective ae·o·ni·an \ ē-ˈō-nē-ən \

variants: or aeonic play \-ˈä-nik\

Definition of aeonian

:lasting for an immeasurably or indefinitely long period of time

… the whole universe is a realm of aeonian conflicts, slow and mighty …
—Gilbert Highet

First Known Use of aeonian

1761

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