entropy

noun

• 1 Physics a thermodynamic quantity representing the unavailability of a system’s thermal energy for conversion into mechanical work, often interpreted as the degree of disorder or randomness in the system: the second law of thermodynamics says that entropy always increases with time [count noun]:the sum of the entropies of all the bodies taking part in the process (Symbol: S)

• 2lack of order or predictability; gradual decline into disorder:a marketplace where entropy reigns supreme

• 3(in information theory) a logarithmic measure of the rate of transfer of information in a particular message or language.