Longman Dictionary of Contemporary English homepage

efficiency

 noun
     
ef‧fi‧cien‧cy S3 W3
1 [uncountable] the quality of doing something well and effectively, without wasting time, money, or energy [≠ inefficient]
efficiency of
the efficiency of the train service
considerable advancements in energy efficiency
2

efficiencies

[plural] the amounts of money, supplies etc that are saved by finding a better or cheaper way of doing something:
operating efficiencies
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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