Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: entropy  en-tru-pee
  1. (communication theory) a numerical measure of the uncertainty of an outcome
    - information, selective information
  2. (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work
    "entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity";
    - randomness, S

Derived forms: entropies

Type of: information measure, physical property

Encyclopedia: Entropy