eon

noun

ˈē-ən  ˈē-ˌän 

variants or chiefly British aeon

1

: an immeasurably or indefinitely long period of time : age

I haven't seen him in eons.

2

a

: a very large division of geologic time usually longer than an era

the Archean eon

b

: a unit of geologic time equal to one billion years

Examples of eon in a Sentence

Recent Examples on the Web

Mighty and majestic with wonderful manes, horses have been part of human life for eons. —Tracy Scott Forson, Smithsonian Magazine, 13 Dec. 2024

And after eons of being imprisoned and thinking of ways to punish his parasitic children, Knull suddenly realizes that Eddie and Venom’s unique symbiosis has created the MacGuffin necessary to set him free. —Charles Pulliam-Moore, The Verge, 24 Oct. 2024

His level of understanding of how marginalized people like himself show up in the world was a lasting legacy the late multi-hyphenate leaves with his eons of fans. —Robyn Mowatt, Essence, 9 Oct. 2024

Presented with the premise that a sprinter will never run 100 meters in, say, five seconds, Lyles wondered what humans could accomplish an eon from now. —Emily Giambalvo, Washington Post, 26 July 2024

Word History

Etymology

borrowed from Late Latin aeōn "age (in the world's history), evil spirit (in Gnosticism)," borrowed from Greek aiṓn "lifetime, long period of time, age" — more at aye entry 3

First Known Use

circa 1642, in the meaning defined at sense 1

Kids Definition

eon

noun

ˈē-ən

1

: a very long period of time

2

a

: a very large division of geologic time usually longer than an era

b

: a unit of geologic time equal to one billion years