Meaning of “lifelong” in the English Dictionary

american-english dictionary

"lifelong" in British English

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lifelongadjective [ before noun ]

uk /ˈlaɪf.lɒŋ/ us /ˈlaɪf.lɑːŋ/

C2 lasting for the whole of a person's life:

She was a lifelong member of the Labour party.
a lifelong habit

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

"lifelong" in American English

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lifelongadjective [ not gradable ]

also life-long us /ˈlɑɪfˌlɔŋ/

lasting for the whole of a person’s life:

He’s had a lifelong interest in science.

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