Webster's Revised Unabridged Dictionary · 1913

Dissociation

Dissociation (?; 106) , noun

[Latin dissociatio: compare French dissociation.]

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.
(Chemistry) 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.