Entry 1 sense Webster, 1913 Dissipativity /(dĭs`sĭ*pȧ*tĭv"ĭ*ty̆)/ · Dis·si·pa·tiv·i·ty · IPA 01 n. The rate at which palpable energy is dissipated away into other forms of energy. 1. The rate at which palpable energy is dissipated away into other forms of energy.