1. (

• information ,
• selective_information ,
• entropy ,

) (communication theory) a numerical measure of the uncertainty of an outcome; "the signal contained thousands of bits of information" ;

2. (

• randomness ,
• entropy ,
• S

) (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" ;