fragmentation has 2 distinct synonyms spread across 1 of its 4 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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 disintegration of social norms governing behavior and thought and social relationships
(computer science) the condition of a file that is broken up and stored in many different locations on a magnetic disk
“fragmentation slows system performance because it takes extra time to locate and assemble the parts of the fragmented file”
the scattering of bomb fragments after the bomb explodes
Synonyms, antonyms and the broader and narrower relations for fragmentation come from Princeton University’s WordNet. Full sources and licences.