Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Releasing energy.
 
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective chemistry, of a reaction  Releasing 
energy (especially asheat ) 
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective (biochemistry) of a process accompanied by the release of energy
 
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[ex(o)– + Greek ergon, work; see  werg- in Indo-European roots + –ic.]
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Examples
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The systems considered above are what biochemists call "exergonic", they are fully spontaneous processes.
NPR Topics: News 2010
 
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