disassociation has 1 distinct synonym spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is association.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the state of being unconnected in memory or imagination
“I could not think of him in disassociation from his wife”
a state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independently
Synonyms, antonyms and the broader and narrower relations for disassociation come from Princeton University’s WordNet. Full sources and licences.