<p><strong>Noun</strong></p><ul><li>plural: efficiencies</li><li>the state or quality of being efficient, or able to accomplish something with the least waste of time and effort; competency in performance.</li><li>accomplishment of or ability to accomplish a job with a minimum expenditure of time and effort: The assembly line increased industry's efficiency.</li><li>the ratio of the work done or energy developed by a machine, engine, etc., to the energy supplied to it, usually expressed as a percentage.</li><li>efficiency apartment.</li></ul>