noun, plural ef·fi·ca·cies.
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Origin of efficacy
OTHER WORDS FROM efficacynon·ef·fi·ca·cy, noun
Words nearby efficacy
How to use efficacy in a sentence
Initial trials should also be evaluated by an International Scientific Advisory Panel—yet to be established—for safety and efficacy before receiving the final go-ahead.A CRISPR Baby Future? New Report Outlines Path to Human Germline Editing|Shelly Fan|September 15, 2020|Singularity Hub
These trials allow scientists to determine the vaccines’ efficacy and identify side effects that may not have appeared in phase 1 or phase 2 trials.China has quietly vaccinated more than 100,000 people for Covid-19 before completing safety trials|Lili Pike|September 11, 2020|Vox
We need to assess safety, and we won’t know the efficacy part until much later.AstraZeneca just paused its COVID-19 vaccine trial, and that’s a good thing|Claire Maldarelli|September 9, 2020|Popular Science
Meanwhile, other experts have questioned the efficacy of Hong Kong’s mass testing as a preventative measure since people are still free to circulate around the city.Hong Kong’s citywide COVID-19 testing has become a barometer of public trust|eamonbarrett|September 9, 2020|Fortune
Just last week, FDA commissioner Stephen Hahn cited misleading statistics about the efficacy of using blood plasma to treat severe Covid-19.A third of Americans might refuse a Covid-19 vaccine. How screwed are we?|Brian Resnick|September 4, 2020|Vox
The eating disorder field remains divided over the potential efficacy of such measures.How Skinny Is Too Skinny? Israel Bans ‘Underweight’ Models|Carrie Arnold|January 8, 2015|DAILY BEAST
On average, the vaccine has an efficacy of about 60 percent.When You Get the Flu This Winter, You Can Blame Anti-Vaxxers|Kent Sepkowitz|January 1, 2015|DAILY BEAST
The efficacy of bandying threats of going to hell met its match in the Civil War.
If there were a pill with such poor efficacy, it might be considered malpractice to prescribe it.‘The Biggest Loser’ Could Be TV’s Most Important Show Ever|Daniela Drake|September 26, 2014|DAILY BEAST
Most Pennsylvanians now support a moratorium on capital punishment until its efficacy can be determined.
The cow happily recovered, which the widow entirely attributed to the efficacy of her pastor's prayer.
It is, therefore, with pleasure I make known the following recipe, which I am assured has been tried with efficacy.
Who can understand its nature, its operations, the sufficiency which is not sufficient, and the efficacy which is ineffectual.A Philosophical Dictionary, Volume 1 (of 10)|Franois-Marie Arouet (AKA Voltaire)
The natural reverence for their remains soon passed into a superstitious veneration and belief in their miraculous efficacy.The Catacombs of Rome|William Henry Withrow
As such, the efficacy of prayer in their regard must be judged according to the principles applying to the latter.Mary, Help of Christians|Various