Last Updated：2025/11/20

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(US) Eternity. / A period of 1,000,000,000 years. / (geology) The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.

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eon

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Source Word

eon

IPA(Pronunciation)

/ˈiː.ɒn/

Noun

US excessive informal

Japanese Meaning

永遠、永久 / 10億年の期間 / 地質学において、何百万年にも及ぶ期間を示す、最も長い地質年代単位（時代に細分される）

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She felt like she had been waiting for an eon before the email finally arrived.

Google Translation / DeepL Translation

彼女は、メールがついに届くまでまるで永遠に待っていたように感じた。

Details

Sense（1）

(US) Eternity.

Sense（2）

A period of 1,000,000,000 years.

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.

Google Translation / DeepL Translation