1(especially in abstract contexts) disconnect or separate:the word ‘spiritual’ has become for many dissociated from religion (
dissociate oneself from)
declare that one is not connected with or a supporter of (someone or something):he took pains to dissociate himself from the religious radicals Psychiatry split off (a component of mental activity) to act as an independent part of mental life.
2 Chemistry (with reference to a molecule) split into separate smaller atoms, ions, or molecules, especially reversibly: [with object]:these compounds are dissociated by solar radiation to yield atoms of chlorine
