DictionaryeternityEndless time
noun

eternity

ih-TER-nuh-tee/ɪˈtɜːrnəti/

Existence or duration without end.

The short wait feels like an eternity to her.

A short microwave countdown feels like eternity: three compact sequential views show the same waiting woman becoming increasingly weary while only twenty seconds pass.
Etymology

The enduring or everlasting base becomes a noun naming that quality. Eternity first meant the quality of being eternal, then came to mean infinite time itself.

In context

Nikola Horvat - Tesla8:23
a day can last a second, blow by like a whirlwind or it can become a whole eternity.
Why do I hike | Award Winning Documentary 2020 (ENGLISH with Chinese, Greek and Czech subs) #hiking

More examples

  • A minute feels like an eternity when you're holding your breath.
  • Their vows promise a love that lasts for eternity.
  • The idea of eternity challenges our ordinary sense of time.

Forms

eternity · eternities

eternal adjective — Lasting forever; having no end.

eternally adverb — Forever or for an endless time.

Similar words

infinity
Infinity also describes limitless space or quantity, not just time.
perpetuity
Perpetuity emphasizes something continuing forever, especially in legal contexts.