Book Description: entropy [??ntr?p?]
n pl -pies
1. (Physics / General Physics) a thermodynamic quantity that changes in a reversible process by an amount equal to the heat absorbed or emitted divided by the thermodynamic temperature. It is measured in joules per kelvin. Symbol S See also law of thermodynamics [1]
2. (Physics / General Physics) a statistical measure of the disorder of a closed system expressed by S = klog P + c where P is the probability that a particular state of the system exists, k is the Boltzmann constant, and c is another constant
3. lack of pattern or organization; disorder
4. (Electronics & Computer Science / Communications & Information) a measure of the efficiency of a system, such as a code or language, in transmitting information
[from en-2 + -trope]