from The American Heritage® Dictionary of the English Language, 4th Edition
- n. For a closed thermodynamic system, a quantitative measure of the amount of thermal energy not available to do work.
- n. A measure of the disorder or randomness in a closed system.
- n. A measure of the loss of information in a transmitted message.
- n. The tendency for all matter and energy in the universe to evolve toward a state of inert uniformity.
- n. Inevitable and steady deterioration of a system or society.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A measure of the amount of information and noise present in a signal. Originally a tongue in cheek coinage, has fallen into disuse to avoid confusion with thermodynamic entropy.
- n. The tendency of a system that is left to itself to descend into chaos.
from the GNU version of the Collaborative International Dictionary of English
- n. A certain property of a body, expressed as a measurable quantity, such that when there is no communication of heat the quantity remains constant, but when heat enters or leaves the body the quantity increases or diminishes. If a small amount, h, of heat enters the body when its temperature is t in the thermodynamic scale the entropy of the body is increased by h ÷ t. The entropy is regarded as measured from some standard temperature and pressure. Sometimes called the thermodynamic function.
from The Century Dictionary and Cyclopedia
- n. In physics: As used by Clausius, the inventor of the word, and others, that part of the energy of a system which cannot be converted into mechanical work without communication of heat to some other body, or change of volume.
- n. As used by Tait and others, the available energy; that part of the energy which is not included under the entropy in sense .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (communication theory) a numerical measure of the uncertainty of an outcome
- n. (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work
German Entropie : Greek en-, in; + Greek tropē, transformation.(American Heritage® Dictionary of the English Language, Fourth Edition)
First attested in 1868. From German Entropie, coined in 1865 by Rudolph Clausius, from Ancient Greek ἐντροπία (entropia, "a turning towards"), from ἐν (en, "in") + τροπή (tropē, "a turning"). (Wiktionary)