Definitions from Wiktionary (efficiency)

▸ noun:  The extent to which a resource is used for the intended purpose.
▸ noun:  (engineering, physics) The ratio of useful work to energy expended. Often given the symbol η.
▸ noun:  The extent to which time is well used for the intended task.
▸ noun:  (dated) The quality of producing an effect or effects.
▸ noun:  (US) A one-room apartment.
▸ Also see efficiency

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