efficiency

/ɪˈfɪʃ.ən.si/ noun B1

The extent to which a resource is used for the intended purpose. (countable, uncountable)
The ratio of useful work to energy expended. Often given the symbol η. (countable, uncountable) · The efficiency of this loudspeaker is 40%.
The extent to which time is well used for the intended task. (countable, uncountable) · The efficiency of the planning department is deplorable.
The quality of producing an effect or effects. (countable, dated, uncountable)
A one-room apartment. (US, countable, uncountable) · I have an efficiency available June through July.· fully-furnished efficiencies

Plural efficiencies

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From the library

If the case has had no other effect, it, at least, brings out in the most striking manner the efficiency of our detective police force, and will serve as a lesson to all foreigners that they will do wisely to settle their feuds at home, and not to carry them on to British soil.

A Study in Scarlet, p. 86 · B2

The amiable suggestion of the birch switch--to the efficiency of which all of Mrs.

Anne of Green Gables, p. 67 · C1

He was always so proud of the efficiency of his department, and this was a crushing blow.”

Sherlock Holmes: The Bruce-Partington Plans, p. 17 · B2

This switch cost inevitably leads to a noticeable reduction in both overall efficiency and output accuracy.

The Myth of Multitasking, p. 1 · C1

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