eon

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Stromatolites in the fossil record decline sharply in both diversity and number during the late Proterozoic eon, although they are present, but not common, in Paleozoic era strata.

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Definitions (6)

Toggle American Heritage definitions American Heritage Dictionary (2)

  1. noun An indefinitely long period of time; an age.
  2. noun The longest division of geologic time, containing two or more eras.

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Examples (50)

  • George Washing-eon used the expression in the popular sense, however, and if it's good enough for the Father of our Country, it's good enough for me My partner would love the sound of it," she said Speaking seriously in a lower voice, Qwilleran said, "Your partner seems like an astute individual. —  Braun_lilian_Jackson_13_The_Cat_Who_Moved_a_Mountain
  • Lemme repeat that I thought this ish of TWS really the best in half an eon, and for Ghu's sake, keep it up! —  Thrilling Wonder Stories April, 1953
  • Could this be the way they operate, destroying species, going into an eon-long dormancy, then resurfacing when summoned again by a new intelligent species? —  InterzoneScienceFictionandFantasyMagazine#214
  • After our interview with the ruler—his title, so we learned, was "Presonio," meaning first judge—the five of us were eon-ducted to the Kont-se-el-Heligz. —  Wonder Stories Quarterly Summer 1932
  • In some far-off eon, ere this earth-journey began, some woman looked at me that way once, just as Titian has this woman look, with the same melting eyes and half-parted lips, and it made an impression on my soul that subsequent incarnations have not effaced. —  Little Journeys to the Homes of Eminent Painters
 

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Roget's II Roget's II: The New Thesaurus

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eon:   eons
Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary. Copyright © 2003, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Etymologies (1)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. Late Latin aeōn, from Greek aiōn; see aiw- in Indo-European roots.
 

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/ˈiɑn/
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