dissociate

Concise Oxford English Dictionary © 2008 Oxford University Press:
dissociate /dɪˈsəʊʃɪeɪt, -sɪ-/

▶verb

• 1 disconnect or separate.

  ■ (dissociate oneself from) declare that one is not connected with or a supporter of.

• 2 Psychiatry cause (a component of mental activity) to undergo dissociation.

• 3 Chemistry undergo or cause to undergo dissociation.

– derivatives
dissociative adjective.

– origin C16: from L. dissociat-, dissociare ‘to separate’.