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efficient 中文解釋 wordnet sense Collocation Usage Collins Definition
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(esp. of a system or machine) Achieving maximum productivity with minimum wasted effort or expense,
  1. (esp. of a system or machine) Achieving maximum productivity with minimum wasted effort or expense
    • - fluorescent lamps are efficient at converting electricity into light
  2. (of a person) Working in a well-organized and competent way
    • - an efficient administrator
  3. Preventing the wasteful use of a particular resource
    • - an energy-efficient heating system

  1. being effective without wasting time or effort or expense; "an efficient production manager"; "efficient engines save gas"
  2. effective: able to accomplish a purpose; functioning effectively; "people who will do nothing unless they get something out of it for themselves are often highly effective persons..."-G.B.Shaw; "effective personnel"; "an efficient secretary"; "the efficient cause of the revolution"
  3. (efficiently) with efficiency; in an efficient manner; "he functions efficiently"
  4. (efficiency) the ratio of the output to the input of any system
  5. Efficient (foaled 2003) is a grey Thoroughbred racehorse gelding, bred in New Zealand, who won the 2007 Melbourne Cup, ridden by Michael Rodd, and the 2006 Victoria Derby.
  6. In statistics, an estimator is called efficient if it estimates the parameter of interest in some “best possible” manner. ...
  7. (Efficiency (aerodynamics)) In aerodynamics, the lift-to-drag ratio, or L/D ratio ("ell-over-dee"), is the amount of lift generated by a wing or vehicle, divided by the drag it creates by moving through the air. ...
  8. (Efficiency (apartment)) A studio apartment, also known as a studio flat (UK), efficiency apartment or bachelor/bachelorette style apartment, is a self-contained, small apartment, which combines living room, bedroom and kitchenette into a single unit, barring a bathroom. ...
  9. (Efficiency (economics)) In economics, the term economic efficiency refers to the use of resources so as to maximize the production of goods and services. ...
  10. (Efficiency (fair division)) Pareto efficiency, or Pareto optimality, is a concept in economics with applications in engineering and social sciences. The term is named after Vilfredo Pareto, an Italian economist who used the concept in his studies of economic efficiency and income distribution. ...
  11. Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy; Using a particular proportion of available energy
  12. (efficiency) The extent to which time is well used for the intended task; The extent to which a resource, such as electricity, is used for the intended purpose; A one-room apartment
  13. (3. Efficiencies) The following are the important efficiencies of a turbine:
  14. (Efficiency (forging)) The amount of applied energy‚ in percentage‚ that is employed in deforming the workpiece to the total energy expended by the forging equipment.
  15. (Efficiency) A general term used to describe how effectively a heat pump, air conditioning system, or furnace converts energy in to energy out. The higher the number, the more efficient the unit, and the lower the operating costs.
  16. (Efficiency) A product's ability to utilize input energy, expressed as a percentage.
  17. Efficiency is a parameter for the effectiveness of the conversion of one form of energy into another. It is defined as the ratio (in per cent) of energy delivered by a system to the energy absorbed by it. ...
  18. The efficiency of a light source is simply the fraction of electrical energy converted to light, i.e., watts of visible light produced for each watt of electrical power with no concern about the wavelength where the energy is being radiated. ...
  19. (efficiency) The ratio of output per unit input or the effectiveness of performance of a system; in an ion exchange system, often expressed as the amount of regenerant required to produce a unit of capacity, such as the pounds of salt per kilograin of hardness removal.
  20. Solar collector efficiency is usually expressed as a percentage value, or in a performance graph. When assessing a collector’s performance make sure it is based on the correct surface area values. Eg. ...
  21. (Efficiency) The ability, expressed as a percent, of a filter to remove a specified artificial contaminant at a given contaminant concentration under specified test conditions.
  22. (Efficiency) a narrow mathematical I concept describing the proportion of a resource that can actually be converted' into useful product or work; for example, sunlight falling on a PV module contains a given amount of energy, but the module can only convert a percentage of it into electricity.
  23. (Efficiency) In optimization, a measurement of how efficient the optimization algorithm is in finding Pareto Optimal solutions. It is generally expresses as a ratio of how many evaluations were done compared to the number of Pareto Optimal points found. For example eArtius?? ...
  24. (Efficiency) A measure (as a percentage) of the actual output to the standard output expected.  Efficiency measures how well someone is performing relative to expectations.
  25. (Efficiency) The ratio of the power output of the photovoltaic cell (module) to the incident power from the sun or other light source under specified standard insolation conditions.