Collins
World English Dictionary
free energy
 
n
Gibbs function See Helmholtz function a thermodynamic property that expresses the capacity of a system to perform work under certain conditions

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

free energy n.
A thermodynamic quantity that is the difference between a system's internal energy and the product of its absolute temperature and entropy; the portion of total energy of a natural system that can be used for work.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
free energy  
A thermodynamic quantity that is the difference between the internal energy of a system and the product of its absolute temperature and entropy. Free energy is a measure of the capacity of the system to do work. If its value is negative, the system will have a tendency to do work spontaneously, as in an exothermic chemical reaction. Free energy is measured in kilojoules per mole. Also called Gibbs free energy.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Sunlight is free energy, but the equipment that captures it and turns it into
  usable electricity can be costly.
Always good to see people forming together to find more ways of free energy.
Closing the station would deprive both tribes of free energy-and a lot of money.
Their main motive has been the growing demand for pollution-free energy sources.
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