from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Eternity.
  • n. A period of 1,000,000,000 years.
  • n. The longest time period used in geology.
  • n. A long period of time.
  • n. A spirit being emanating from the Godhead.

from the GNU version of the Collaborative International Dictionary of English

  • n. An immeasurable or infinite space of time; eternity; a long space of time; an age.
  • n. One of the embodiments of the divine attributes of the Eternal Being.

from The Century Dictionary and Cyclopedia

  • n. A long space of time; a secular period, either indefinite or limited to the duration of something, as a dispensation or the universe: used as equivalent to age, era, or cycle, and sometimes to eternity.
  • n. In Platonic philosophy, a virtue, attribute, or perfection existing throughout eternity.
  • n. The largest divisionof geologic-time: used by J. D. Dana especially in dividing the archœan into astral and archæozoic eons.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe
  • n. the longest division of geological time
  • n. an immeasurably long period of time


Late Latin aeōn, from Greek aiōn; see aiw- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek αἰών (aiōn, "age"). (Wiktionary)



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