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
That these famous names were dedicating time and energy to the cause nearly two years later felt to me like a poor attempt to rectify what felt like eons of damning, upsetting silence.
—
Shaad D’souza, Pitchfork, 18 Sep. 2025
The oceans and atmosphere are massive and, importantly, open, shaped by far-reaching forces that act on timescales ranging from hours to eons.
—Gregory Barber, Quanta Magazine, 15 Sep. 2025
According to the study authors, dark energy’s effect on the universe isn’t fixed, but appears to have shifted over the eons.
—Rupendra Brahambhatt, Interesting Engineering, 23 Aug. 2025
The flora and fauna of Kenya have thrived across the region for eons, and at Mukima Manor, wildlife conservation is a core tenet of the hotel’s ethos.
—Jared Ranahan, Forbes.com, 21 Aug. 2025
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Shaad D’souza, Pitchfork, 18 Sep. 2025
The oceans and atmosphere are massive and, importantly, open, shaped by far-reaching forces that act on timescales ranging from hours to eons.
—Gregory Barber, Quanta Magazine, 15 Sep. 2025
According to the study authors, dark energy’s effect on the universe isn’t fixed, but appears to have shifted over the eons.
—Rupendra Brahambhatt, Interesting Engineering, 23 Aug. 2025
The flora and fauna of Kenya have thrived across the region for eons, and at Mukima Manor, wildlife conservation is a core tenet of the hotel’s ethos.
—Jared Ranahan, Forbes.com, 21 Aug. 2025
See All Example Sentences for eon
Cite this Entry
“Eon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eon. Accessed 22 Sep. 2025.
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