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efficiency (EN)
noun

noun “efficiency”

singular efficiency, plural efficiencies or uncountable
  1. the ability to do tasks well without wasting time or energy
    The manager praised her efficiency in completing the tasks ahead of schedule.
  2. (in engineering) a measure of how much useful work is done compared to the energy used
    The efficiency of the solar panels has greatly improved.
  3. (US) a small one-room apartment with a bathroom and kitchenette
    He rented an efficiency in the city center.