- 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"
--1 is a kind of physical property
--1 has particulars: conformational entropy - randomness, haphazardness, stochasticity, noise - the quality of lacking any predictable order or plan
--2 is a kind of irregularity, unregularity
--2 has particulars: ergodicity