efficiency

/i fish"euhn see/, n., pl. efficiencies.
1. the state or quality of being efficient; competency in performance.
2. accomplishment of or ability to accomplish a job with a minimum expenditure of time and effort: The assembly line increased industry's efficiency.
3. the ratio of the work done or energy developed by a machine, engine, etc., to the energy supplied to it, usually expressed as a percentage.
[1585-95; < L efficientia, equiv. to efficient- (see EFFICIENT) + -ia -Y3]

* * *

In mechanics, the measure of the effectiveness with which a system performs.

It is stated as the ratio of a system's work output to its work input. The efficiency of a real system is always less than 1 because of friction between moving parts. A machine with an efficiency of 0.8 returns 80% of the work input as work output; the remaining 20% is used to overcome friction. In a theoretically frictionless, or ideal, machine, the work input and work output are equal, and the efficiency would be 1, or 100%.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Efficiency — as a technical term may refer to: * Algorithmic efficiency, optimizing the speed and memory requirements of a computer program * Efficient energy use, useful work per quantity of energy ** Energy conversion efficiency, desired energy output per… …   Wikipedia

  • efficiency — apartment efficiency apartment n., a small apartment[4], sometimes furnished, with minimal kitchen and bath facilities. The unit may comprise a single room plus a bathroom, and the kitchen facilities are often open to the main room, or may form a …   The Collaborative International Dictionary of English

  • efficiency — 1590s, power to accomplish something, from L. efficientia (from efficientem; see EFFICIENT (Cf. efficient)) + CY (Cf. cy). In mechanics, ratio of useful work done to energy expended, from 1858. Attested from 1952 as short for efficiency apartment …   Etymology dictionary

  • Efficiency — relationship between the result achieved and the resources used (p. 3.2.15 ISO 9000:2005). Источник …   Словарь-справочник терминов нормативно-технической документации

  • efficiency — ► NOUN (pl. efficiencies) 1) the state or quality of being efficient. 2) an action intended to achieve efficiency …   English terms dictionary

  • efficiency — [e fish′ən sē, ifish′ən sē] n. pl. efficiencies [L efficientia: see EFFICIENT] 1. ability to produce a desired effect, product, etc. with a minimum of effort, expense, or waste; quality or fact of being efficient 2. the ratio of effective work to …   English World dictionary

  • efficiency — I noun ability, ableness, adeptness, adroitness, capability, capableness, command, competence, competency, deftness, dexterity, dexterousness, effectiveness, efficacy, efficientia, excellence, expertness, handiness, helpfulness, mastery, potency …   Law dictionary

  • efficiency — [n] adeptness, effectiveness ability, abundance, adaptability, address, adequacy, capability, capableness, competence, competency, completeness, economy, effectualness, efficacy, energy, expertise, facility, faculty, know how, performance,… …   New thesaurus

  • Efficiency — Reflects the amount of wasted energy. The New York Times Financial Glossary * * * efficiency ef‧fi‧cien‧cy [ɪˈfɪʆnsi] noun [uncountable] MANUFACTURING 1. how well an industrial process, factory, or business works so that it produces as much as… …   Financial and business terms

  • efficiency — Because of futures contracts standardization of terms, large numbers of traders from all walks of life may trade futures, thus allowing prices to be determined readily (it is more likely that someone will want a contract at any given price). The… …   Financial and business terms

  • efficiency — noun ADJECTIVE ▪ ruthless ▪ great, high ▪ attempts to achieve greater efficiency in the production process ▪ improved, increased ▪ …   Collocations dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.