1. (

• 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" ;

2. (

• randomness ,
• haphazardness ,
• stochasticity ,
• noise

) the quality of lacking any predictable order or plan ;