an indefinitely long period of time; age.
the largest division of geologic time, comprising two or more eras.
Astronomy. one billion years.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use eon in a sentence
This is due partly to the lack of chromosome-level genomic information and partly to the suspicion that eons of evolutionary change have washed away any clues about that...Secrets of Early Animal Evolution Revealed by Chromosome ‘Tectonics’ | Viviane Callier | February 2, 2022 | Quanta Magazine
As parts of planetary bodies that have formed and evolved over literal eons, scientists can gain important cosmological insights from studying these fallen space rocks.A meteorite-hunting AI will scout for space rocks buried in polar ice | Tatyana Woodall | January 26, 2022 | Popular-Science
Some older theories suggest that gas giants are a product of rock and ice aggregating as it circles the Sun, gathering a cloud of solids and, later, gases like hydrogen and helium over eons.
You can traverse eons by brushing your fingers over the layers of a cliff wall.The Ghost of Ancient Earth’s Magma Oceans Found in Greenland Rocks | Jason Dorrier | March 14, 2021 | Singularity Hub
That means, in theory, at least one extra planet may have been whizzing around the sun in eons past, knocking Neptune for a loop.Neptune’s bumpy childhood could reveal our solar system’s missing planets | Charlie Wood | January 8, 2021 | Popular-Science
Bush ran his last competitive race in 1998, an eon ago in political terms.
Each change was supposed to denote the birth of some angel or celestial being known as an eon.The World's Sixteen Crucified Saviors | Kersey Graves
Action with a purpose is deliberate; it involves a consciously foreseen end and a mental weighing of considerations pro and eon.Democracy and Education | John Dewey
He descended to the edge of the clearing and picked his way through the debris of some eon-old geologic catastrophe.First on the Moon | Jeff Sutton
After what seemed an eon it struck the edge of the subway kiosk, bounced like a rag doll and sprawled across the pavement.The End of Time | Wallace West
After what seemed an eon of waiting, he ventured another look ahead.The Valley of the Giants | Peter B. Kyne
British Dictionary definitions for eon
the usual US spelling of aeon
geology the longest division of geological time, comprising two or more eras
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for eon
The longest division of geologic time, containing two or more eras.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.