be+efficient
131x-efficient — x efficiency ˌx efˈficiency noun [uncountable] COMMERCE HUMAN RESOURCES the ability of a business to achieve the best results in the most economic way in relation to the number of employees, machines etc it has: • the x efficiency of commercial… …
132energy-efficient — also energy efficient ADJ GRADED A device or building that is energy efficient uses relatively little energy to provide the power it needs. ...energy efficient light bulbs. ...information on how to make your home more energy efficient …
