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noun
Capacity or power to produce a desired effect.
synonym: efficacy.
is a specific kind of: effectiveness, effectivity, effectuality, effectualness.
is an attribute of: efficacious | inefficacious.
is the opposite of: inefficaciousness, inefficacy.
derivation: effective, effectual, efficacious.
Dutch: werkzaamheid, doeltreffendheid, effectiviteitPolish: skuteczność
Find more on efficaciousness elsewhere: etymology - rhymes - Wikipedia.
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