efficiency (EN)

noun

noun “efficiency”

1. the ability to do tasks well without wasting time or energy
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   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.