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"Eficiencia" is a noun which is often translated as "efficiency", and "eficacia" is a noun which is also often translated as "efficiency". Learn more about the difference between "eficiencia" and "eficacia" below.
la eficiencia(
eh
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fee
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syehn
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syah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (general)
a. efficiency
Los voluntarios limpiaron el salón con rapidez y eficiencia.The volunteers cleaned the hall with speed and efficiency.
la eficacia(
eh
-
fee
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kah
-
syah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
a. efficiency
Marta demostró gran eficacia en su trabajo y por eso la ascendieron.Marta showed great efficiency at her job and that's why she got promoted.
a. effectiveness (of a remedy)
La eficacia del paracetamol en el alivio del dolor es probado.The effectiveness of paracetamol in the pain relief is proven.
b. efficacy (formal)
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
La eficacia de las drogas nuevas no serán comprobadas hasta que recibamos los resultados de los exámenes.The efficacy of the new drugs won't be confirmed until after we receive the results of the tests.
