D defs.my
Entry 2 senses Webster, 1913

Dissociation

/dĭs-ōsˌ-ē-āsh'-ən/ · Dis·so·ci·a·tion · IPA /dɪˌsoʊsiˈeɪʃən/
01 n. The act of dissociating or disuniting; a state of separation; disunion.
  1. 1.
    The act of dissociating or disuniting; a state of separation; disunion.
    “It will add infinitely dissociation, distraction, and confusion of these confederate republics.” Burke.
  2. 2.
    The process by which a compound body breaks up into simpler constituents; -- said particularly of the action of heat on gaseous or volatile substances; as, the dissociation of the sulphur molecules; the dissociation of ammonium chloride into hydrochloric acid and ammonia.(Chem.)