entropy

(noun) (communication theory) a numerical measure of the uncertainty of an outcome. Synonyms: information, selective information. Examples: "The signal contained thousands of bits of information."

(noun) (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work. Synonyms: randomness, S. Examples: "Entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity."