Entropy - Definition

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]