aeon

noun

ae·​on

chiefly British spelling of eon

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 aeon in a Sentence

it's been aeons since I saw a movie at the multiplex

glaciers that formed aeons ago

Kids Definition

aeon

chiefly British variant of eon