How do you spell Efficiency?
Correct spelling
efficiency
Two F's, ends in ENCY. EFFICI + ENCY.
Why is efficiency spelled this way?
From Latin efficientia, an accomplishing. EX (out) + FACERE (to make). Efficiency is making the most out of what you have — maximum result from minimum input.
Common misspellings of efficiency
efficencyeficiencyefficiancyefficeency
Example
We need to improve energy efficiency.