Definition of lifelong adjective from the Oxford Advanced American Dictionary

 

lifelong

 adjective
adjective
NAmE//ˈlaɪflɔŋ//
 
[only before noun]
 
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lasting or existing all through your life Her lifelong ambition had been to learn how to fly. He has been a lifelong supporter of the club.
See the Oxford Advanced Learner's Dictionary entry: lifelong