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Definition of beneficial adjective from the Oxford Advanced Learner's Dictionary

Academic

beneficial

adjective
beneficial pronunciation English ˌbenɪˈfɪʃl beneficial pronunciation American ˌbenɪˈfɪʃl
 
beneficial (to something/somebody) (formal) improving a situation; having a helpful or useful effect
Synonym
advantageous, favourableA good diet is beneficial to health.They finally came to a mutually beneficial agreement.
Opposite
detrimental