Word:

Entropy

En´tro`py
n.1.(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.
- Clausius.
Noun1.entropy - (communication theory) a numerical measure of the uncertainty of an outcome; "the signal contained thousands of bits of information"
2.entropy - (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work; "entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity"
Synonyms: randomness, S
(theory)entropy - 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.
EDP, abeyance, aloofness, amorphia, amorphism, amorphousness, anarchy, apathy, bit, blurriness, catalepsy, catatonia, channel, chaos, communication explosion, communication theory, confusion, data retrieval, data storage, deadliness, deathliness, decoding, derangement, diffusion, disarrangement, disarray, disarticulation, discomfiture, discomposure, disconcertedness, discontinuity, discreteness, disharmony, dishevelment, disintegration, disjunction, dislocation, disorder, disorderliness, disorganization, dispersal, dispersion, disproportion, disruption, dissolution, disturbance, dormancy, electronic data processing, encoding, formlessness, fuzziness, haphazardness, haziness, incoherence, inconsistency, indecisiveness, indefiniteness, indeterminateness, indifference, indiscriminateness, indolence, inertia, inertness, information explosion, information theory, inharmonious harmony, irregularity, languor, latency, lotus-eating, messiness, mistiness, most admired disorder, noise, nonadhesion, noncohesion, nonsymmetry, nonuniformity, obscurity, orderlessness, passiveness, passivity, perturbation, promiscuity, promiscuousness, randomness, redundancy, scattering, separateness, shapelessness, signal, stagnancy, stagnation, stasis, suspense, torpor, turbulence, unadherence, unadhesiveness, unclearness, unsymmetry, untenacity, ununiformity, upset, vagueness, vegetation, vis inertiae
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