aeon. In geology, an eon is an abritrary length of time having no specific length of age.

Geologists subdivide an eon into eras.

An eon is the the category encompassing the largest periods of time in geologic eon is an exact 2.

geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history) geological era, era - a major division of geological time; an era is usually divided into two or more periods. 1 : an immeasurably or indefinitely long period of time : age I haven't seen him in eons.

Every hour of Earth is an eon and her day has yet many hours.

Definition of eon. It is the longest period of geological time. Noun. The Masque of the Elements | Herman Scheffauer Only once in an eon or so is it vouchsafed a writer to write a masterpiece at the age of nine years. It is the longest period of geological time. Eon, Long span of geologic time.

How Long Is an Eon?

An eon is a very long time indeed.

1. eon - the longest division of geological time. Although astronomers and geologists use the word "eon" to mean 1 billion years, it is more commonly used to refer to any long, indefinite period of time. Both are just really long periods of time, but in science an eon is about a billion years.

In formal usage, eons are the longest portions of geologic time ( era s are the second-longest). Less formally, eon often refers to a span of one billion years. 2 a : a very large division of geologic time usually longer than an era the Archean eon. You can use the noun eon for anything that takes a long while, including how long it will be before another planet collides with Earth or how many days until summer vacation starts — … Three eons are recognized: the Phanerozoic Eon (dating from the present back to the beginning of the Cambrian Period), the Proterozoic Eon, and the Archean Eon.

b : a unit of geologic time equal to one billion years.

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