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efficient diversification
efficient frontier
efficient set
effigy
effing
effloresce
efflorescence
effluence
effluent
effluvium
efflux
effort
effortless
effrontery
effulgence
effuse
effusion
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efficiency

ef·fi·cien·cy [ i físh'nsee ] (plural ef·fi·cien·cies)


noun 
Definition:
 
1. competence: the ability to do something well or achieve a desired result without wasted energy or effort

2. productive use of resources: the degree to which something is done well or without wasted energy

3. measure of machine's energy effectiveness: the ratio of the amount of energy used by a machine to the amount of work done by it. For example, the measurement of the amount of heat produced per unit of fuel when all of a fuel has been burned is a measure of a heating unit's efficiency.

4. domestic 
Same as  efficiency apartment


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