<p><strong>Noun</strong></p><ul><li>an act or instance of dissociating.</li><li>the state of being dissociated; disjunction; separation: the dissociation of church and state.</li><li>Physical Chemistry: 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.</li><li>electrolytic dissociation.</li><li>Psychiatry: the splitting off of a group of mental processes from the main body of consciousness, as in amnesia or certain forms of hysteria.</li></ul>