Able to produce a desired or intended result, especially in relation to a particular task or activity. Something that is efficacious is effective and produces the expected outcome.
“The new marketing strategy has proven to be efficacious in increasing sales and expanding the customer base.”— Business
“The software update included several efficacious patches that resolved the previously reported issues and improved overall system performance.”— Technology
Origin: From Latin efficax, meaning 'effective', derived from efficere, which is a combination of ex- 'out' and facere 'to do'.
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