The Correct spelling is: efficiency
Common misspellings of the word efficiency are:
How do you spell efficiency?. It is not effeciency or even efficency for that matter!
n., pl. -cies.
- The quality or property of being efficient.
- The degree to which this quality is exercised: The program was implemented with great efficiency and speed.
- The ratio of the effective or useful output to the total input in any system.
- The ratio of the energy delivered by a machine to the energy supplied for its operation.
- An efficiency apartment.