Meaning of “eternal” in the English Dictionary

"eternal" in British English

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eternaladjective

uk /ɪˈtɜː.nəl/ us /ɪˈtɝː.nəl/
eternally
adverb uk /ɪˈtɜː.nəl.i/ us /ɪˈtɝː.nəl.i/

the eternally changing seasons
eternally weary/sad/cheerful
formal I'd be eternally (= very or always) grateful if you could arrange it.

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

"eternal" in American English

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eternaladjective [ not gradable ]

us /ɪˈtɜr·nəl, i-/

lasting forever, or seeming to be without end:

They swore eternal loyalty to each other.
eternally
adverb [ not gradable ] us /ɪˈtɜr·nəl·i, i-/

I’d be eternally grateful if you’d handle it.

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