Usage Note
Eficiencia is about achieving results with minimal waste — closer to English 'efficiency' than eficacia, which stresses effectiveness (getting the right outcome regardless of cost). In engineering and business contexts the two words are often contrasted: eficacia = does it work? eficiencia = does it work economically?
Examples
"La eficiencia de la máquina aumentó un veinte por ciento."
Natural Translation
The machine's efficiency increased by twenty percent.
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