efficacious
/ˌɛfɪˈkeɪʃəs/
adjective
formal
- (of something inanimate or abstract) successful in producing a desired or intended result; effective."this treatment was efficacious in some cases"
efficacious
quid pro quo /ˌkwɪd prəʊ ˈkwəʊ/ noun noun : quid pro quo ; plural noun : quid pro quos a favour or advantage granted in return for...
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