Relating to or lasting for an aeon; extremely ancient or of immense duration.
From aeon + -ial (adjective suffix). Aeon comes from Greek aion, originally meaning 'lifetime' or 'age,' later expanded to mean an immensely long period.
When geologists talk about 'aeonial timescales,' they're describing something so old that human history is just a blink—the aeonial age of rocks makes our oldest civilizations seem like yesterday. It puts our existence into humbling perspective.
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