Aeon/ˈiːən,ˈiːɑːn/ Definition 1 of 3Pro Tip 1/3Figurative Use Often used to stress an unmeasurable duration, not an exact time frame. We waited for aeons to get a response. Pro Tip 2/3Exaggeration Used to emphasize that something took or lasts a very long time, often longer than one would like. I haven't seen you in aeons! Pro Tip 3/3Literary Flair Adds a poetic or dramatic touch to writing, suitable for creative literature. Her memory will be cherished for aeons.