noun
- an extremely long period of time
- a major division of geological time
Usage: geology
Examples
- It felt like eons since I had seen my old friend.
- The universe has existed for eons.
- Dinosaurs lived eons ago.
- She waited for what seemed like an eon.
- The Phanerozoic eon began about 540 million years ago.
- Geological eons are divided into smaller time periods called eras.
- After eons of erosion, the mountains were worn down.