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What is the singular of efficacy?

What's the singular form of efficacy? Here's the word you're looking for.

Answer

The noun efficacy can be countable or uncountable.

The singular form of efficacy is also efficacy.

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In addition, Fettweis's belief in the dominance and efficacy of air power seems misplaced.
A systematic study was carried out to evaluate its antitumour efficacy against B16 murine melanoma.
For the review, Lebovitz and his team re-examined the data from 13 studies that originally aimed to examine the efficacy and safety of Avandia.
Then it designed clinical trials to test whether its drugs could extend life, an unequivocal proof of efficacy.
Opioids that should be avoided because of low efficacy and high side effect burden include meperidine, codeine, and propoxyphene.
Current evidence on the efficacy of acupressure and acupuncture in treating pregnancy-induced nausea is inconclusive.

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