The ability to do something well without wasting time, energy, or resources.
From Latin 'efficientia' meaning 'power of producing', from 'efficiens' meaning 'accomplishing'. Over time it shifted from pure ability to how well input is turned into output.
Efficiency is about getting the most result for the least cost—time, energy, or money. Sometimes chasing efficiency alone can backfire, like overloading schedules or systems until they break.
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