entropy

en·tro·py

noun \ˈen-trə-pē\

plural en·tro·pies

Definition of ENTROPY

: a measure of the unavailable energy in a closed thermodynamic system that is also usually considered to be a measure of the system's disorder and that is a property of the system's state and is related to it in such a manner that a reversible change in heat in the system produces a change in the measure which varies directly with the heat change and inversely with the absolute temperature at which the change takes place; broadly : the degree of disorder or uncertainty in a system

—en·tro·pic \en-ˈtrōp-ik, -ˈträp-\ adjective

—en·tro·pi·cal·ly \-i-k(ə-)lē\ adverb