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English definition of “eternal”

eternal

adjective [not gradable]  /ɪˈtɜr·nəl, i-/ us  
lasting forever, or seeming to be without end: They swore eternal loyalty to each other.
eternally
adverb [not gradable]  /ɪˈtɜr·nəl·i, i-/ us  
I’d be eternally grateful if you’d handle it.
(Definition of eternal from the Cambridge Academic Content Dictionary © Cambridge University Press)
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