eon
2 synonyms and 2 antonyms for eon, grouped by meaning and by how common each one is.
Noun — An extremely long or indefinite period of time.
Synonyms
Everyday swaps
Common words most readers know — safe in any writing.
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
aeon
Antonyms
How to use eon
The word patterns that sound natural to a native speaker.
eons ago
for eons
geological eon
eons of time
The everyday sense is casual and exaggerated, while the geological sense is precise and technical.
Etymology
The word comes from Latin 'aeon', which itself derives from the Ancient Greek 'aion', meaning age or era.
Full origin of eon →Frequently asked questions
What does 'eon' mean?
It means an extremely long or indefinite stretch of time, and in geology it refers to the largest formal division of Earth's history.
Is 'eon' the same as 'aeon'?
Yes, 'aeon' is simply an alternative spelling of 'eon', more commonly used in Commonwealth English.
How long is a geological eon?
A geological eon spans hundreds of millions of years and is made up of several smaller eras.
