Efficiency in one word answer is productivity, effectiveness, or economy, but the single most encompassing one-word definition is productivity because it captures the essence of output versus input. However, if you want the most precise technical one-word answer, it is output-input ratio or optimization, while in everyday language the best one-word synonym is effectiveness or doing more with less. Some might answer efficiency in one word as capability, proficiency, or competence when referring to people, and as economy or thrift when referring to resource use. In physics, the one-word answer could be ratio, as in useful energy divided by total energy. The challenge is that efficiency is a broad concept that includes ideas of speed, skill, lack of waste, and achievement of goals, so no single word perfectly captures all aspects. If forced to choose the most universally understood one-word definition for general use, productivity is probably best because it conveys getting maximum results from minimum resources, which is the core idea of efficiency, though effectiveness is also commonly accepted as the one-word essence meaning ability to produce desired result without waste.
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