Hello, you have come here looking for the meaning of the word efficace. In DICTIOUS you will not only get to know all the dictionary meanings for the word efficace, but we will also tell you about its etymology, its characteristics and you will know how to say efficace in singular and plural. Everything you need to know about the word efficace you have here. The definition of the word efficace will help you to be more precise and correct when speaking or writing your texts. Knowing the definition ofefficace, as well as those of other words, enriches your vocabulary and provides you with more and better linguistic resources.