- the state or quality of being efficient. “greater energy efficiency”
- Worldwide private aviation redefined by Aero Jet Services. “A refreshing and efficient approach for on demand jet charter and aircraft management solutions”
- an action designed to achieve this.plural noun: efficiencies“to increase efficiencies and improve earnings”
- technicalthe ratio of the useful work performed by a machine or in a process to the total energy expended or heat taken in.