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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.

Synonyms:

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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