evolution has 4 distinct synonyms spread across 2 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 devolution.
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.
a process in which something passes by degrees to a different stage (especially a more advanced or mature stage)
“the development of his ideas took many years”
Synonyms, antonyms and the broader and narrower relations for evolution come from Princeton University’s WordNet. Full sources and licences.
(biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms