Meaning of “lifelong” in the English Dictionary

american-english dictionary

"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)