Definition of efficacy in English:

efficacy

noun

formal
  • The ability to produce a desired or intended result.

    ‘there is little information on the efficacy of this treatment’
    • ‘Clinical trials are in progress to assess its efficacy in severe asthma.’
    • ‘It has proved efficacy in the treatment of depression and has been shown to be cost effective.’
    • ‘He argued that monitoring of treatment efficacy would be difficult and expensive.’
    • ‘The trials also showed that efficacy is sustained during a one-year treatment period.’
    • ‘Well, I don't have a huge list of examples but I've seen enough to convince me of it's efficacy.’
    • ‘The partisanship has even reduced their efficacy as a binding force of our nation.’
    • ‘The sooner the morning after pill is taken after sex the greater its efficacy.’
    • ‘In order to have any efficacy whatever, a world organization must be able to override big states as well as small ones.’
    • ‘Concerns about the safety and efficacy of human cloning, then, do not warrant a ban in law.’
    • ‘It'll be some time before the safety and efficacy of the other products is proven.’
    • ‘Our aim was not to assess efficacy of antibiotics but the effectiveness of prescribing strategies.’
    • ‘They have had seven matches together, but judgment on their efficacy has been reserved.’
    • ‘The report noted that it does not evaluate the actual efficacy of the programs themselves.’
    • ‘Drugs with comparable efficacy but better safety profiles later appeared on the market.’
    • ‘Blood tests may be needed periodically to monitor the treatment and its efficacy.’
    • ‘However, there is very little evidence on the comparative efficacy of classes of drugs.’
    • ‘There was a lack of data on efficacy and adverse effects for all the other drugs.’
    • ‘The power of transformation or efficacy of the commodity is often a selling point.’
    • ‘The government claims this is part of a research project to test the safety and efficacy of the drug.’
    • ‘On its own this finding is insufficient to define the relative efficacy of the two treatments.’
    success, successfulness, productiveness, fruitfulness, potency, power
    effectiveness, success, successfulness, productiveness, fruitfulness, potency, power
    View synonyms

Origin

Early 16th century: from Latin efficacia, from efficax, efficac- (see efficacious).

Pronunciation

efficacy

/ˈefəkəsē//ˈɛfəkəsi/