Pareto efficiency or Pareto optimality is a situation where no action or allocation is available that makes one individual better off without making another worse off.
In aerodynamics, the lift-to-drag ratio is the lift generated by an aerodynamic body such as an aerofoil or aircraft, divided by the aerodynamic drag caused by moving through air.
In thermodynamics, the thermal efficiency is a dimensionless performance measure of a device that uses thermal energy, such as an internal combustion engine, steam turbine, steam engine, boiler, furnace, refrigerator, ACs etc.
In microeconomics, economic efficiency, depending on the context, is usually one of the following two related concepts: Allocative or Pareto efficiency: any changes made to assist one person would harm another.
In network science, the efficiency of a network is a measure of how efficiently it exchanges information and it is also called communication efficiency.
In mechanical engineering, mechanical efficiency is a dimensionless number that measures the efficiency of a mechanism or machine in transforming the power input to the device to power output.
In finance, marginal conditional stochastic dominance is a condition under which a portfolio can be improved in the eyes of all risk-averse investors by incrementally moving funds out of one asset and into another.
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