the state or quality of being efficient; competency in performance.

accomplishment of or ability to accomplish a job with a minimum expenditure of time and effort

The assembly line increased industry's efficiency.

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.

efficiency apartment.

noun

helplessness , impotence , inability , incompetence , ineffectiveness , inefficiency , weakness

noun

ability , abundance , adaptability , address , adequacy , capability , capableness , competence , competency , completeness , economy , effectualness , efficacy , energy , expertise , facility , faculty , know-how , performance , potency , power , powerfulness , productiveness , productivity , proficiency , prowess , quantity , readiness , resourcefulness , response , skill , skillfulness , suitability , suitableness , talent , thoroughnessnotes:competence is a measure of the ability to perform a task; efficiency is a measure of the success achieved in the performance of a task , effectiveness , effectuality , efficaciousness , influence