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Efficiency 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 (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