Definition

A very long period of time, often used in geology to describe the largest divisions of time in Earth's history.

Example

The dinosaurs lived during the Mesozoic eon, which lasted millions of years.

Conversation

Have you ever thought about how long an eon really is?

Not really, but it sounds like forever!

Yeah, it's hard to imagine such a long stretch of time.

I guess it puts our lives into perspective, doesn't it?

Synonyms & Antonyms

Root Explanation

**Eon** → The word 'eon' originates from the Greek 'aion' (αἰών), meaning an age or a long period of time. It refers to an indefinitely long period, often used in geological or cosmological contexts to describe vast spans of time.

Memory Tip

Think of the Greek word 'aion' meaning an age or long period — this helps you remember that 'eon' refers to a very long time.

Visually Confused Words