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invaluable

adjective
 
 
/ɪnˈvæl.jʊ.bl̩/

Definition

C1 extremely useful: The new job will provide you with invaluable experience. Such data will prove invaluable to/for researchers.Useful or advantageous
(Definition of invaluable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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