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Definition of efficiency:

  1. The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
  2. The ratio of useful work to energy expended.


skill, potency, thoroughness, efficaciousness, capacity, response, effectualness, energy, aptitude, faculty, powerfulness, industrious, influence, cogency, competence, thrive, might, power, productivity, force, productiveness, expertness, susceptibility, adaptability, affect, readiness, adequacy, qualification, dexterity, capability, effectuality, proficiency, effect, strength, ability, cleverness, performance, competency, efficacy, talent, yield, elasticity.

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