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 ...

is the extent to which time or effort is well used for the intended task or purpose. Efficiency may also refer to: * Efficiency (aerodynamics), the amount of lift divided by the aerodynamic drag * Efficiency (apartment), a one-room apartment * Efficiency (basketball), a statistical benchmark to compare the overall value of players * Efficiency (economics), a situation in which nothing can be improved without something else being hurt ** Efficiency (fair division), any changes made to assist one person would harm another * Efficiency (finance), non-mean-variance portfolio analysis, a way of showing that a portfolio is not efficient * Efficiency (mechanical) * Efficiency (network science), a measure of how efficiently a network exchanges information * Efficiency (statistics), a measure of quality of an estimator, experiment, or test * Energy efficiency (physics), the ratio of power consumed to useful power output

See also