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
Recent Examples on the Web
Each syllable an aeon, each body its true size.
—
Jana Prikryl, Harpers Magazine, 19 Sep. 2025
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Jana Prikryl, Harpers Magazine, 19 Sep. 2025
Cite this Entry
“Aeon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aeon. Accessed 6 Oct. 2025.
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