eon
🇺🇸
/ˈiːən/
🇬🇧
/ˈiːən/
An unimaginably long period of time, often used to describe something that feels like it happened a very long time ago.
It feels like eons have passed since we last saw each other.
A very long period of time in geology, usually divided into eras.
Over the course of an eon, the Earth has undergone many changes.