dis·so·ci·ate 
(d
ĭ-s
ōs
ē-
āt
′, -sh
ē-)
v. dis·so·ci·at·ed, dis·so·ci·at·ing, dis·so·ci·ates
v.tr.1. To remove from association; separate: "Marx never dissociated man from his social environment" (Sidney Hook).
2. Chemistry To cause to undergo dissociation.
v.intr.1. To cease associating; separate; part.
2. Chemistry & Psychiatry To undergo dissociation.
[Latin dissociāre, dissociāt- : dis-, dis- + sociāre, to unite (from socius, companion; see sekw-1 in the Appendix of Indo-European roots).]