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eon

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eon¹

  • /ˈi.ɑn/ Canada, US
  • /ˈeɪ.ɑn/ Canada, US
  • /ˈiː.ɔn/ UK
  • /ˈeɪ.ɔn/ UK
  • /ˈiː.ən/ UK, dated
  • /ˈiː.ɔn/ Australia
  • /ˈeɪ.ɔn/ Australia

Sounds like (dated pronunciation) Ian · Rhymes with -iːɒn, (UK, dated) -iːən

Where it comes from

From Latin aeon, from Ancient Greek αἰών (aiṓn, “age, era”).

noun eons · aeon · æon

  1. Eternity, the duration of the universe.
  2. An immeasurably or indefinitely long period of time.
  3. US, excessive, informal A long period of time. It’s been eons since we last saw each other.
  4. A period of one billion (short scale, i.e. 1,000,000,000) years; a gigayear. We live our lives in three dimensions for our threescore and ten allotted years. Yet every branch of contemporary science, from statistics to cosmology, alludes to processes that operate on scales outside of human experience: the millisecond and the nanometer, the eon and the light-year.
  5. The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.
  6. A spirit being emanating from the Godhead.

Similar: aeon, age, ages, blue moon, coon's age, crow's age, dog's age, donkey's years, eld, eon, eternity, forever, forever and a day, interim, interlude, interval, lifetime, long haul, long run, meantime, minute, month of Sundays, spell, while, years, yonks · Opposite: jiffy, moment, never in a month of Sundays

EON²

Where it comes from

From Greek ΕΟΝ (EON), short for Εθνική Οργάνωση Νεολαίας.

proper noun

  1. The Greek National Organisation of Youth, similar to the Hitler Youth. It was formed before WWII and disbanded in 1941.

Thesaurus

noun

Similar: aeon, age, ages, blue moon, coon's age, crow's age, dog's age, donkey's years, eld, eon, eternity, forever, forever and a day, interim, interlude, interval, lifetime, long haul, long run, meantime, minute, month of Sundays, spell, while, years, yonks · Opposite: jiffy, moment, never in a month of Sundays

Translations

Every language

noun period of 1,000,000,000 years

Españoleón
Portuguêséon
Françaiséon

noun eternity

Españoleón, eternidad
हिन्दीअनंतकाल anantkāl
Portuguêseternidade
Françaiséternité
Русскийве́чность véčnostʹ

noun informal, hyperbolic: a long period of time

Españolañares, añales
Portuguêseternidade
Françaisbail
Italianoeone
Русскийты́сяча лет týsjača let, целая ве́чность celaja véčnostʹ
עבריתעִדָּן idán

noun geochronologic unit

Españoleón, evo
한국어누대 nudae, 이언 ieon
日本語累代 ruidai
中文宙 zhòu
Portuguêséon
Françaiséon
DeutschÄon
Italianoeone
Русскийэо́н eón
עבריתעִדָּן idán

noun a being emanating from the Godhead

日本語アイオーン aiōn
Portuguêséon
Italianoeone
Русскийэо́н eón

Talk about this word

Cite this
MLA

"eon." Wiktionary, via Micwyn, micwyn.com/word/eon. Accessed 6 Nov. 2026.

APA

eon. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/eon

Chicago

"eon." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/eon.

BibTeX
@misc{eon_2026,
  title = {eon},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/eon},
  urldate = {2026-11-06}
}