entropy

noun

1. (communication theory) a numerical measure of the uncertainty of an outcome

   noun.attribute

   Synonyms information selective information

   Source: WordNet 3.0

2. (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work

   noun.attribute

   Examples

   Entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.

   Synonyms randomness s

   Source: WordNet 3.0

3. 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, <i>h</i>, of heat enters the body when its temperature is <i>t</i> in the thermodynamic scale the entropy of the body is increased by <i>h &?; t</i>. The entropy is regarded as measured from some standard temperature and pressure. Sometimes called the <i>thermodynamic function</i>.

   noun

   Source: webster1913