randomness

(noun) (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work. Synonyms: entropy, S. Examples: "Entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity."

(noun) the quality of lacking any predictable order or plan. Synonyms: haphazardness, stochasticity, noise.