the limited efficacity of the primitive tool as an instrument for cutting raw meat
Recent Examples on the WebEmploying touchscreens for voting results in the adoption of technology for its own sake rather than to provide efficacity.
Letter Writers, Twin Cities, 10 Nov. 2019
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Middle English efficacite, borrowed from Middle French & Latin; Middle French efficacité, borrowed from Latin efficācitāt-, efficācitās, from efficāc-, efficāx "capable of fulfilling a function, efficacious" + -itāt-, -itās-ity