from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Releasing energy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Releasing energy (especially as heat)
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. (biochemistry) of a process accompanied by the release of energy
The systems considered above are what biochemists call "exergonic", they are fully spontaneous processes.