ef·fi·cien·cy /ɪˈfɪʃənsi/ noun plural ef·fi·cien·cies
the ability to do something or produce something without wasting materials, time, or energy :
the quality or degree of being efficient [noncount
] ▪ Because of her efficiency, we got all the work done in a few hours. ▪ The factory was operating at peak efficiency. ▪ a car with greater fuel efficiency [=a car that uses fuel more efficiently] ▪ A furnace with 80 percent fuel efficiency wastes 20 percent of its fuel.
) ▪ The company is trying to lower costs and improve efficiencies.
] US : efficiency apartment