WordReference Random House Unabridged Dictionary of American English © 2017
dis•so•ci•a•tion  (di sō′sē āshən, -shē ā-),USA pronunciation n. 
  1. an act or instance of dissociating.
  2. the state of being dissociated;
    separation:the dissociation of church and state.
  3. Chemistry[Physical Chem.]
    • the reversible resolution or decomposition of a complex substance into simpler constituents caused by variation in physical conditions, as when water gradually decomposes into hydrogen and oxygen under great heat in such a way that when the temperature is lowered the liberated elements recombine.
    • See  electrolytic dissociation. 
  4. Psychiatrythe splitting off of a group of mental processes from the main body of consciousness, as in amnesia or certain forms of hysteria.
  • dis-1 + (as)sociation, modeled on Latin dissociātiō separation 1605–15

WordReference Random House Learner's Dictionary of American English © 2017
dis•so•ci•ate /dɪˈsoʊʃiˌeɪt, -si-/USA pronunciation   v. [+ object + from + object], -at•ed, -at•ing. 
  1. to cut off or separate the association of; disconnect:He tried to dissociate himself from his past.
dis•so•ci•a•tion /dɪˌsoʊʃiˈeɪʃən, -si-/USA pronunciation  n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2017
dis•so•ci•ate  (di sōshē āt′, -sē-),USA pronunciation v.,  -at•ed, -at•ing. 
  1. to sever the association of (oneself );
    separate:He tried to dissociate himself from the bigotry in his past.
  2. to subject to dissociation.

  1. to withdraw from association.
  2. to undergo dissociation.
dis•soci•a′tive, adj. 
  • dis-1 + (as)sociate, modeled on Latin dissociātus, past participle of dissociāre to divide, sever 1605–15

Collins Concise English Dictionary © HarperCollins Publishers::

dissociation /dɪˌsəʊsɪˈeɪʃən -ʃɪ-/ n
  1. the act of dissociating or the state of being dissociated
  2. a reversible chemical change of the molecules of a single compound into two or more other molecules, atoms, ions, or radicals
  3. the separation of a group of mental processes or ideas from the rest of the personality, so that they lead an independent existence, as in cases of multiple personality

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