+**Eons** are the largest defined units of [Time](/wiki/time), representing immense and often indeterminate stretches of existence. In [Geologic Time](/wiki/geologic_time), an eon spans hundreds of millions to billions of years, marking major phases in Earth's history and the universe's evolution.
+## See also
+- [Era](/wiki/era)
+- [Period](/wiki/period)
+- [Geology](/wiki/geology)
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