eon

C2+ Topic:Time

Also spelled aeon

US /ˈiˌɑn/ UK /ˈiːɒn/ See IPA manual

Meanings

1

noun
an immeasurably long period of time; the largest division of geologic time

The canyon was carved over an eon of patient erosion.

Thesaurus

Synonyms

1 noun · an immeasurably long period... age era epoch eternityaeon

Opposites

instant moment

Word family

Derived forms eonian

Related forms aeon

Simplified etymology

Aeon entered English in the late 16th century through ecclesiastical Latin from Greek aiōn, meaning “age.” It is usually used in the plural in phrases such as aeons ago.

Etymology

From Latin aeon, from Ancient Greek aiṓn ('age, lifetime, eternity'), from Proto-Indo-European *h₂eyu- ('vital force, lifetime').

aeon Latin αἰών Ancient Greek *h₂eyu- Proto-Indo-European

View etymology graph ->

Topics

Time

External links

# eon

**Type:** Word
**Level:** C2+
**Part of speech:** noun
**IPA (US):** /ˈiˌɑn/
**IPA (UK):** /ˈiːɒn/

## Meanings
1. an immeasurably long period of time; the largest division of geologic time

## Examples
- The canyon was carved over an eon of patient erosion.

## Synonyms
- age
- era
- epoch
- eternity
- aeon

## Antonyms
- instant
- moment

## Derived Forms
- eonian

## Related Forms
- aeon

## Roots and Affixes
- Root: aeon
- Root: αἰών
- Root: *h₂eyu-

## Etymology
From Latin aeon, from Ancient Greek aiṓn ('age, lifetime, eternity'), from Proto-Indo-European *h₂eyu- ('vital force, lifetime').

## AI Etymology
Eon comes from Latin aeon, from Ancient Greek aiṓn ('age, lifetime, eternity'), from Proto-Indo-European *h₂eyu- ('vital force, lifetime'). The development is chiefly a borrowing or learned continuation, carrying an older form and meaning into English rather than building the word from a purely native base. In present use, it is used as a noun meaning "an immeasurably long period of time; the largest division of geologic time", so the historical material remains connected with the current sense rather than standing as bare ancestry. The wider English family includes derivatives such as eonian and related forms such as aeon, showing how the same historical material continues to organize neighboring vocabulary. The named historical forms include Latin aeon, Ancient Greek αἰών, and Proto-Indo-European *h₂eyu-, keeping the history tied to concrete forms rather than a loose resemblance. Its semantic neighborhood is marked by age, era, epoch, and eternity on one side and contrasts such as instant and moment on the other, locating the modern specialization without adding a new origin story.

## Topics
- Time

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eon