- the state or quality of being efficient, or able to accomplish something with the least waste of time and effort; competency in performance.
- accomplishment of or ability to accomplish a job with a minimum expenditure of time and effort: The assembly line increased industry's efficiency.
- 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.
- efficiency apartment.
Origin of efficiency
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for efficiencies
And both natural gas and efficiencies benefit the environment and promise some move toward long-term sustainability.Obama-Republican Fight Over Gas Prices Is Pure Political Theater
April 18, 2012
It is the most efficient type of water-wheel, efficiencies of 90 per cent.
How do you account for any differences in the efficiencies found?
The efficiencies are shown along the bottom line, and the 100 per cent.A Rational Wages System
These efficiencies are in terms of the most efficient (yellow-green) light.
Of course, the efficiencies of light-sources are usually of interest to the consumer if they are expressed in terms of cost.
- the quality or state of being efficient; competence; effectiveness
- the ratio of the useful work done by a machine, engine, device, etc, to the energy supplied to it, often expressed as a percentageSee also thermal efficiency
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for efficiencies
Online Etymology Dictionary, © 2010 Douglas Harper
- The production of the desired effects or results with minimum waste of time, effort, or skill.
- A measure of effectiveness; specifically, the useful work output divided by the energy input in any system.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- The ratio of the energy delivered (or work done) by a machine to the energy needed (or work required) in operating the machine. The efficiency of any machine is always less than one due to forces such as friction that use up energy unproductively. See also mechanical advantage.
- The ratio of the effective or useful output to the total input in any system.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.