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5 definitions found
 for entropy
From The Collaborative International Dictionary of English v.0.48 :

  Entropy \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.
     [1913 Webster]
           The entropy of the universe tends towards a maximum.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Heat \Heat\ (h[=e]t), n. [OE. hete, h[ae]te, AS. h[=ae]tu,
     h[=ae]to, fr. h[=a]t hot; akin to OHG. heizi heat, Dan. hede,
     Sw. hetta. See Hot.]
     1. A force in nature which is recognized in various effects,
        but especially in the phenomena of fusion and evaporation,
        and which, as manifested in fire, the sun's rays,
        mechanical action, chemical combination, etc., becomes
        directly known to us through the sense of feeling. In its
        nature heat is a mode of motion, being in general a form
        of molecular disturbance or vibration. It was formerly
        supposed to be a subtile, imponderable fluid, to which was
        given the name caloric.
        [1913 Webster]
     Note: As affecting the human body, heat produces different
           sensations, which are called by different names, as
           heat or sensible heat, warmth, cold, etc., according to
           its degree or amount relatively to the normal
           temperature of the body.
           [1913 Webster]
     2. The sensation caused by the force or influence of heat
        when excessive, or above that which is normal to the human
        body; the bodily feeling experienced on exposure to fire,
        the sun's rays, etc.; the reverse of cold.
        [1913 Webster]
     3. High temperature, as distinguished from low temperature,
        or cold; as, the heat of summer and the cold of winter;
        heat of the skin or body in fever, etc.
        [1913 Webster]
              Else how had the world . . .
              Avoided pinching cold and scorching heat! --Milton.
        [1913 Webster]
     4. Indication of high temperature; appearance, condition, or
        color of a body, as indicating its temperature; redness;
        high color; flush; degree of temperature to which
        something is heated, as indicated by appearance,
        condition, or otherwise.
        [1913 Webster]
              It has raised . . . heats in their faces. --Addison.
        [1913 Webster]
              The heats smiths take of their iron are a blood-red
              heat, a white-flame heat, and a sparkling or welding
              heat.                                 --Moxon.
        [1913 Webster]
     5. A single complete operation of heating, as at a forge or
        in a furnace; as, to make a horseshoe in a certain number
        of heats.
        [1913 Webster]
     6. A violent action unintermitted; a single effort; a single
        course in a race that consists of two or more courses; as,
        he won two heats out of three.
        [1913 Webster]
              Many causes . . . for refreshment betwixt the heats.
        [1913 Webster]
              [He] struck off at one heat the matchless tale of
              "Tam o' Shanter."                     --J. C.
        [1913 Webster]
     7. Utmost violence; rage; vehemence; as, the heat of battle
        or party. "The heat of their division." --Shak.
        [1913 Webster]
     8. Agitation of mind; inflammation or excitement;
        exasperation. "The heat and hurry of his rage." --South.
        [1913 Webster]
     9. Animation, as in discourse; ardor; fervency; as, in the
        heat of argument.
        [1913 Webster]
              With all the strength and heat of eloquence.
        [1913 Webster]
     10. (Zool.) Sexual excitement in animals; readiness for
         sexual activity; estrus or rut.
         [1913 Webster +PJC]
     11. Fermentation.
         [1913 Webster]
     12. Strong psychological pressure, as in a police
         investigation; as, when they turned up the heat, he took
         it on the lam. [slang]
     Animal heat, Blood heat, Capacity for heat, etc. See
        under Animal, Blood, etc.
     Atomic heat (Chem.), the product obtained by multiplying
        the atomic weight of any element by its specific heat. The
        atomic heat of all solid elements is nearly a constant,
        the mean value being 6.4.
     Dynamical theory of heat, that theory of heat which assumes
        it to be, not a peculiar kind of matter, but a peculiar
        motion of the ultimate particles of matter.
     Heat engine, any apparatus by which a heated substance, as
        a heated fluid, is made to perform work by giving motion
        to mechanism, as a hot-air engine, or a steam engine.
     Heat producers. (Physiol.) See under Food.
     Heat rays, a term formerly applied to the rays near the red
        end of the spectrum, whether within or beyond the visible
     Heat weight (Mech.), the product of any quantity of heat by
        the mechanical equivalent of heat divided by the absolute
        temperature; -- called also thermodynamic function, and
     Mechanical equivalent of heat. See under Equivalent.
     Specific heat of a substance (at any temperature), the
        number of units of heat required to raise the temperature
        of a unit mass of the substance at that temperature one
     Unit of heat, the quantity of heat required to raise, by
        one degree, the temperature of a unit mass of water,
        initially at a certain standard temperature. The
        temperature usually employed is that of 0[deg] Centigrade,
        or 32[deg] Fahrenheit.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: (communication theory) a numerical measure of the
           uncertainty of an outcome; "the signal contained thousands
           of bits of information" [syn: information, selective
           information, entropy]
      2: (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" [syn: randomness, entropy, S]

From Moby Thesaurus II by Grady Ward, 1.0 :

  107 Moby Thesaurus words for "entropy":
     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

From The Free On-line Dictionary of Computing (18 March 2015) :

      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
     Shannon's formula gives the entropy H(M) of a message M in
     	H(M) = -log2 p(M)
     Where p(M) is the probability of message M.

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