Definitions
capacity or power to produce a desired effect
Word origin
From Old French efficace, from Late Latin efficācia (“efficacy”), from efficāx (“efficacious”); see efficacious.
Used in a sentence
“[…]and this hath even made me ſuſpect the efficacy of reliques, to examine the bones, queſtion the habits and appurtenances of Saints, and even of Chriſt himſelf.”
The Religion of a Doctor“Toothbrush with improved efficacy”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Effectiveness”8 letters
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