dissipation has 6 distinct synonyms spread across 2 of its 3 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.
breaking up and scattering by dispersion
“the dissipation of the mist”
dissolute indulgence in sensual pleasure
useless or profitless activity; using or expending or consuming thoughtlessly or carelessly
“if the effort brings no compensating gain it is a waste”
Synonyms, antonyms and the broader and narrower relations for dissipation come from Princeton University’s WordNet. Full sources and licences.