Meaning & use
eon
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An extremely long, indefinite period of time; in geology, the largest division of time.
See it in a sentence
It felt like an eon before the doctor finally called her name.
The Phanerozoic eon includes all of geologic time in which complex life has existed.
A note on using this word
Also spelled "aeon," especially in British English; used both loosely, for a very long time, and precisely, in geology.
Words with a similar meaning
ageera
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
instantmoment
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