entropy

noun8

1. •
   A measure of the disorder present in a system.
2. •
   A measure of the disorder directly proportional to the natural logarithm of the number of microstates yielding an equivalent thermodynamic macrostate.
3. •
   A measure of the amount of energy in a physical system that cannot be used to do work.
4. •
   The capacity factor for thermal energy that is hidden with respect to temperature.
5. •
   The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature.
6. •
   The tendency of a system that is left to itself to descend into chaos.
7. •
   Shannon entropy
8. •
   A measure of the amount of information and noise present in a signal.