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Meaning of ENTROPY

Pronunciation:  'entrupee

WordNet Dictionary
  1. [n]  (communication theory) a numerical measure of the uncertainty of an outcome; "the signal contained thousands of bits of information"
  2. [n]  (thermodynamics) a measure of the amount of energy in a system that is no longer available for doing work; entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity

ENTROPY is a 7 letter word that starts with E.


 Synonyms: information, selective information
 Antonyms: ectropy
 See Also: conformational entropy, information measure, physical phenomenon



Webster's 1913 Dictionary
\En"tro*py\, n. [Gr. ? a turning in; ? in + ? a turn,
fr. ? to turn.] (Thermodynamics)
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.

      The entropy of the universe tends towards a maximum.

Computing Dictionary

A measure of the disorder of a system. Systems tend to go from a state of order (low entropy) to a state of maximum disorder (high entropy).

The entropy of a system is related to the amount of information it contains. A highly ordered system can be described using fewer bits of information than a disordered one. For example, a string containing one million "0"s can be described using run-length encoding as [("0", 1000000)] whereas a string of random symbols (e.g. bits, or characters) will be much harder, if not impossible, to compress in this way.

shannon's formula gives the entropy H(M) of a message M in bits:

        H(M) = -log2 p(M)

Where p(M) is the probability of message M.

Biology Dictionary
 Definition: The amount of disorder in a system.
Thesaurus Terms
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