• WordNet 3.6
    • n efficiency skillfulness in avoiding wasted time and effort "she did the work with great efficiency"
    • n efficiency the ratio of the output to the input of any system
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Webster's Revised Unabridged Dictionary
  • Interesting fact: Keeping your car tuned up is a good way to save on gas. A car that is tuned up is 9% more efficient on gasoline.
    • efficiency The quality of being efficient or producing an effect or effects; efficient power; effectual agency. "The manner of this divine efficiency being far above us."
    • efficiency (Mech) The ratio of useful work to energy expended.
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Century Dictionary and Cyclopedia
  • Interesting fact: Apples, not caffeine, are more efficient at waking you up in the morning
    • n efficiency The quality of being efficient; effectual agency; competent power; the quality or power of producing desired or intended effects.
    • n efficiency Specifically— The state of being able or competent; the state of possessing or having acquired adequate knowledge or skill in any art, profession, or duty: as, by patient perseverance he has attained a high degree of efficiency.
    • n efficiency In mech., the ratio of the useful work performed by a prime motor to the energy expended. Synonyms Efficacy, etc. See effectiveness.
    • n efficiency Angström's method. Another method of measuring the radiant efficiency of a source of light is due to Knut Ångström. An opaque screen is mounted in such a position as to cut off all rays lying beyond the red end of the visible spectrum, and the remaining radiation is assembled upon the face of a bolometer by means of a cylindrical lens. The ratio of this quantity to the total radiation, measured by the same instrument, gives the radiant efficiency of the source of light. The radiant efficiency of such sources of light as have been measured by the two methods thus described is given in the following table. The values obtained by the integration of the energy-curves and by Ångström's method are marked respectively L and A.
    • n efficiency While other sources of light have not as yet been measured by these methods, their relative efficiencies are approximately known, and by comparison with the above data we know that the radiant efficiency of ordinary oil- and gas-flames is about .01, that of the glow-lamp from .01 to .03, and that of the electric arc from .04 to .08. Gross efficiency. The term efficiency is likewise used to express the ratio of the energy in light-giving form developed in unit time by a source to the energy of combustion of the fuel which it is necessary to consume in order to maintain the source during that time. The efficiency thus defined takes into account the total heat-losses in the production of light. In the case of the flames of candles and of oil-lamps the heat lost by convection and conduction is very large compared with the total radiation from the flame. In the case of gas-flames the heat of combustion of the coal necessary to produce the gas to maintain the flame, as compared with the luminous energy emitted by the flame, gives the gross efficiency. In computing the gross efficiency of electric lights the heat of combustion of the fuel used to generate the current supplied to the lamps or the equivalent amount of energy, whatever be its source, is to be taken. In the case of a steam-plant for electric lighting the losses by dissipation of heat in the boiler, engine, dynamo, and lead-wires, together with the loss by convection and conduction in the electric lamp itself, all enter into the computation of the gross efficiency. Whatever process for the production of light may be employed, the amount of energy dissipated for the purpose of obtaining luminous radiation is very great, and the gross efficiency of luminous flames used in lighting ranges from .001 to .002, while the gross efficiency of electric lamps under the best existing conditions for the production of power is little if any above these figures. Electric efficiency. It is convenient in the case of the electric light to express the efficiency in watts per candle—a method not comparable with the energy-ratio defined above, but useful for the comparison of the various types of lamp used in electric lighting. The electric efficiency of the ordinary lamp ranges between four watts per candle and three watts per candle, according to the temperature of the filament, that of the arc-light from two watts per candle to one watt per candle (mean spherical candle-power), while the efficiency of the Nernst lamp is intermediate between that of the arc and the glow-lamp.
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Chambers's Twentieth Century Dictionary
  • Interesting fact: The reason why bubbles are round is because this is the most efficient shape that the soap film can take for the amount of air trapped inside
    • ns Efficiency power to produce the result intended, adequate fitness
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  • David Dunham
    David Dunham
    “Efficiency is intelligent laziness.”
  • Arnold Bennett
    “If egotism means a terrific interest in one's self, egotism is absolutely essential to efficient living.”
  • Harry S Truman
    “Whenever you have an efficient government, you have a dictatorship.”
  • Aneurin Bevan
    “I would rather be kept alive in the efficient if cold altruism of a large hospital than expire in a gush of warm sympathy in a small one.”
  • Shirley Conran
    Shirley Conran
    “I make no secret of the fact that I would rather lie on a sofa than sweep beneath it. But you have to be efficient if you're going to be lazy.”
  • Sir Humphrey Davy
    Sir Humphrey Davy
    “Language is not only the vehicle of thought, it is a great and efficient instrument in thinking.”


Webster's Revised Unabridged Dictionary
L. efficientia,
Chambers's Twentieth Century Dictionary
Fr.,—L. efficiens, -entis, pr.p. of efficĕreex, out, facĕre, to make.


In literature:

The dominant feature of the task is an endeavor to find a compromise between efficiency and capital outlay.
"Principles of Mining" by Herbert C. Hoover
The field efficiency of an organization depends primarily upon its effectiveness as a whole.
"Manual of Military Training" by James A. Moss
Organization thus becomes a test of class efficiency, and consequently a prerequisite for solving the farm problem.
"Chapters in Rural Progress" by Kenyon L. Butterfield
Still there was a certain pretence of a desire for efficiency, a double pseudo-efficiency.
"The Cult of Incompetence" by Emile Faguet
The political machinery provided a sufficient channel for the really efficient force of public opinion.
"The English Utilitarians, Volume I." by Leslie Stephen
Although this preliminary filter was operated at a high rate, its efficiency was quite satisfactory.
"Transactions of the American Society of Civil Engineers, vol. LXXII, June, 1911" by E. D. Hardy
George's duty as plugman was to watch the engine, to see that it kept well in work, and that the pumps were efficient in drawing the water.
"Lives of the Engineers The Locomotive. George and Robert Stephenson" by Samuel Smiles
He conducted the office with honesty and efficiency.
"History of Education" by Levi Seeley
Each company wore a different tartan, but that did not interfere with their efficiency.
"The Red Watch" by J. A. Currie
The squadrons take to France, in August 1914, all efficient pilots, and all serviceable machines.
"The War in the Air; Vol. 1" by Walter Raleigh

In poetry:

Unquestioned those, efficient these,
All costs and fees enforced,
The Court now orders and decrees
John Marshall is divorced.
"John Marshall's Divorce" by Samuel Alfred Beadle
By it they stand, by it they fall,
What e'er the ambiguities,
They look to its intrinsic call,
For metes and bounds efficiencies.
"The Deed Vs. Assessment Rolls" by Samuel Alfred Beadle

In news:

Do you ever wonder how Web Callback delivers a better customer experience while improving Contact Center efficiency.
Efficient Cary trash truck pushes four miles a gallon.
The dietary additives did not improve calf weight gain, feed intake or feed efficiency in any of the trials.
The new AG-HMC150 camcorder uses AVCHD, a long GOP compression standard based on MPEG-4 AVC/H.264 high profile encoding AVCHD provides a near doubling of bandwidth efficiency and improved video performance over MPEG-2 compression.
Benefit from the fastest turnaround time in the market and high cost efficiency.
Everything, it seems, is getting more energy-efficient.
With gasoline prices on the rise, it's important to make sure your vehicle's engine is running effectively and efficiently.
The buildup of deposits inside an engine can be like a slowly growing cancer: If left unattended, it can gradually rob an engine of its power, fuel efficiency, and ultimately, its driveability.
In an effort to improve the efficiency of carpool and decrease traffic congestion, morning carpool for fifth grade only at Henderson Ward Stewart Elementary School is being rerouted to Pilcher Street beginning this Monday.
Carpenter and green-building expert Tim Snyder shares his knowledge about energy efficiency and home improvement.
Consider Three Ways to Energy Efficiency.
The YORK YVAA air-cooled variable-speed screw chiller was manufactured by Johnson Controls for efficiency, reduced sound, and sustainability.
Mobil SHC 600 Series lubricants offer significant energy efficiency benefits.
It improves flow and heating efficiency in water-based equipment such as boilers, water heaters or storage tanks by dissolving lime, scale and rust deposits.
A new form of alternative fuels recovers energy from post-consumer or post-industrial plastic wastes that cannot be recycled efficiently.

In science:

This project is not focused on the internal workings of the Memex device. We assume that all of the processing, data storage, indexing and retrieval is done efficiently in the background and that any of the data stored can be quickly and easily accessed.
Human Information Processing with the Personal Memex
This capacity allows then to efficiently access and use knowledge from their LTM.
Human Information Processing with the Personal Memex
In their theory, there are capacity constraints in WM and the degree of information encapsulation in WM determines the efficiency and power of the system.
Human Information Processing with the Personal Memex
For our project, we assume that this massive amount of collected information is magically, efficiently organized during the night and any part of it can be easily accessed.
Human Information Processing with the Personal Memex
For our project, we assume that this massive amount of collected information is efficiently organized during the night and any part of it can be easily accessed.
Human Information Processing with the Personal Memex