Meaning of “eternity” in the English Dictionary

american-english dictionary

"eternity" in British English

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eternitynoun

uk /ɪˈtɜː.nə.ti/ us /ɪˈtɝː.nə.t̬i/

[ U ] time that never ends or that has no limits:

They haven't been given these rights for (all) eternity - they should justify having them just like most other people have to.
Religions gain some of their worldly power by claiming they have the key to eternity (= a state of existence outside normal life).
an eternity

a very long time:

The movie went on for what seemed like an eternity.
Nine months is a long time for anyone, but it's an eternity for the very young.

(Definition of “eternity” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"eternity" in American English

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eternitynoun [ U ]

us /ɪˈtɜr·nɪ·t̬i/

time that never ends:

At her age, even a few months can seem like an eternity.

(Definition of “eternity” from the Cambridge Academic Content Dictionary © Cambridge University Press)