eon

American  

[ee-uhn, ee-on] / ˈi ən, ˈi ɒn /

Or aeon

noun

1. an indefinitely long period of time; age.

2. the largest division of geologic time, comprising two or more eras.

3. Astronomy. one billion years.

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eon British  

/ ˈiːən, ˈiːɒn /

noun

1. the usual US spelling of aeon

2. geology the longest division of geological time, comprising two or more eras

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eon Scientific  

/ ē′ŏn′ /

1. The longest division of geologic time, containing two or more eras.

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Usage

What does eon mean? Eon is commonly used in a general way to refer to an indefinitely long period of time. Outside of science, people usually use eon as a way to exaggerate how long something took to happen or how long something lasted.In the context of geology, eon refers to the largest division of geological time. Technically speaking, an eon is made up of two or more eras, which consist of several periods, which are divided into epochs.All of these units of time vary as to their exact length, but most consist of at least millions of years, with eons lasting billions or hundreds of millions of years.In the context of astronomy, an eon is one billion years.Example: It took me eons to get a straight answer as to how long an eon actually is.

Etymology

Origin of eon

aeon