n.1. The act of dissociating or the condition of having been dissociated.
2. Chemistry a. The process by which the action of a solvent or a change in physical condition, as in pressure or temperature, causes a molecule to split into simpler groups of atoms, single atoms, or ions.
b. The separation of an electrolyte into ions of opposite charge.
3. Psychiatry A disintegration or fragmentation of the mind in which memories, thoughts, or aspects of the personality become disconnected, as in multiple personality disorder or some kinds of amnesia.