Definition of "entropy" in English

noun

1. A measure of the disorder present in a system.

2. (thermodynamics, countable) A measure of the amount of energy in a physical system that cannot be used to do work.

3. The capacity factor for thermal energy that is hidden with respect to temperature.

4. The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature.

5. (statistics, information theory, countable) A measure of the amount of information and noise present in a signal.

6. (uncountable) The tendency of a system that is left to itself to descend into chaos.