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efficiency

 
Noun efficiency has 2 senses
  1. efficiency - the ratio of the output to the input of any system
    --1 is a kind of
    ratio
  2. efficiency - skillfulness in avoiding wasted time and effort; "she did the work with great efficiency"
    --2 is a kind of
    skillfulness
    Antonyms: inefficiency
    --2 has particulars: economy
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