Finesentence mobile logo
Sign in Login / Register

Eon Meaning: Definition, Examples, and Translations

🕰️
Add to dictionary

eon

[ˈiː.ən ]

Definition

Context #1 | Noun

time period

An eon is a long and indefinite period of time, often used in geology and astronomy. In geological terms, an eon is the largest division of geological time, comprising several eras. An eon can span billions of years and is often categorized into different epochs. The term is also sometimes used more colloquially to describe any lengthy period.

Synonyms

age, epoch, era, period.

Examples of usage

  • The Earth has existed for more than four eons.
  • We are currently living in the Phanerozoic eon.
  • The changes in climate occurred over several eons.
  • Studying eons helps scientists understand Earth's history.

Translations

To see the translation, please select a language from the options available.

Origin of 'eon'

The word 'eon' originates from the Greek word 'aiōn', which means 'age' or 'lifetime'. This term was adapted into Latin as 'aion'. In the 16th century, 'eon' began to take on its current geological meaning, denoting an indefinitely long span of time perceived in the context of Earth's history. The concept became more formalized with advancements in geology during the 19th century when scientists sought to categorize Earth's timeline. Over time, eons were defined as the largest divisions of geological time, anchoring periods such as the Precambrian and the Phanerozoic in the geological time scale.

Word Frequency Rank

At rank #27,661, this word represents specialized academic or technical vocabulary. It's less frequently encountered but may be valuable in specific contexts.