from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The hypothetical continuous operation of an isolated mechanical device or other closed system without a sustaining energy source.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The
motionof some hypothetical devicethat continues foreverwith no obvious inputof energyin violationof the lawsof thermodynamics.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun motion that continues indefinitely without any external source of energy; impossible in practice because of friction
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