Accuracy vs. Efficiency — What's the Difference?

Difference Between Accuracy and Efficiency
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Definitions
Accuracy➦
The state of being accurate; being free from error; exactness; correctness
Efficiency➦
Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste.
Accuracy➦
The quality or state of being correct or precise
We have confidence in the accuracy of the statistics
Efficiency➦
The quality or property of being efficient.
Accuracy➦
Conformity to fact.
Efficiency➦
The degree to which this quality is exercised
The program was implemented with great efficiency and speed.
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Accuracy➦
Precision; exactness.
Efficiency➦
The ratio of the effective or useful output to the total input in any system.
Accuracy➦
The ability of a measurement to match the actual value of the quantity being measured.
Efficiency➦
The ratio of the energy delivered by a machine to the energy supplied for its operation.
Accuracy➦
Exact conformity to truth, or to a rule or model; degree of conformity of a measure to a true or standard value.
The jury doubted the accuracy of the witness' comments.
Efficiency➦
An efficiency apartment.
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Accuracy➦
The state of being accurate; freedom from mistakes, this exemption arising from carefulness; exact conformity to truth, or to a rule or model; precision; exactness; nicety; correctness; as, the value of testimony depends on its accuracy.
The professed end [of logic] is to teach men to think, to judge, and to reason, with precision and accuracy.
The accuracy with which the piston fits the sides.
Efficiency➦
The extent to which time is well used for the intended task.
The efficiency of the planning department is deplorable.
Accuracy➦
The quality of nearness to the truth or the true value;
He was beginning to doubt the accuracy of his compass
The lawyer questioned the truth of my account
Efficiency➦
(dated) The quality of producing an effect or effects.
Accuracy➦
(mathematics) the number of significant figures given in a number;
The atomic clock enabled scientists to measure time with much greater accuracy
Efficiency➦
The extent to which a resource is used for the intended purpose; the ratio of useful work to energy expended.
The efficiency of this loudspeaker is 40%.
Efficiency➦
(US) A one-room apartment.
I have an efficiency available June through July.
Fully-furnished efficiencies
Efficiency➦
The ratio of the output to the input of any system
Efficiency➦
Skillfulness in avoiding wasted time and effort;
She did the work with great efficiency