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[ee-uh n, ee-on] /ˈi ən, ˈi ɒn/
an indefinitely long period of time; age.
the largest division of geologic time, comprising two or more eras.
Astronomy. one billion years.
Also, aeon.
see aeon Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for eons
  • In nature, all experiments are rigorously tested over eons.
  • The water is contaminated naturally by sandstone, which has slowly leached radioactive contaminants over the eons.
  • The zone can shift over the eons as the star ages and becomes brighter and hotter.
  • As a result, the water would theoretically remain frozen for eons.
  • The magical shaft of light will soon be gone, the tides will transform the waves, the eons will change the rocks.
  • Their playful nature and high intelligence have endeared them to people for eons.
  • As the eons go by, the astronaut then witnesses his corner of the universe evolve.
  • Therefore, this ocean could have remained liquid for eons.
  • It takes eons for this stuff to leave the ecosystem.
  • The isotopes, in turn, reveal a picture of the climate eons ago.
British Dictionary definitions for eons


/ˈiːən; ˈiːɒn/
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
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Word Origin and History for eons



1640s, from Latin aeon, from Greek aion "age, vital force, a period of existence, lifetime, generation;" in plural, "eternity," from PIE root *aiw- "vital force, life, long life, eternity" (cf. Sanskrit ayu "life," Avestan ayu "age," Latin aevum "space of time, eternity," Gothic aiws "age, eternity," Old Norse ævi "lifetime," German ewig "everlasting," Old English a "ever, always").

Online Etymology Dictionary, © 2010 Douglas Harper
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eons in Science
The longest division of geologic time, containing two or more eras.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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