/ ˌbenɪˈfɪʃl; NAmE / adjective
beneficial (to sth/sb) improving a situation; having a helpful or useful effect
SYN advantageous , favourable :
a good diet is beneficial to health
OPP detrimental
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WORD ORIGIN
late Middle English : from late Latin beneficialis , from beneficium favour, support, from bene well + facere do.