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ENTROPY

Definition:

[noun] (communication theory) a numerical measure of the uncertainty of an outcome; "the signal contained thousands of bits of information"
Synonyms: information, selective information
[noun] (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"
Synonyms: randomness