associate has 15 distinct synonyms spread across 5 of its 9 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 dissociate.
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 person with subordinate membership in a society, institution, or commercial enterprise
“associates in the law firm bill at a lower rate than do partners”
any event that usually accompanies or is closely connected with another
“first was the lightning and then its thunderous associate”
a degree granted by a two-year college on successful completion of the undergraduates course of studies
make a logical or causal connection
“I cannot connect these two pieces of evidence in my mind”
bring or come into association or action
“The churches consociated to fight their dissolution”
1 of the 9 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for associate.
Synonyms, antonyms and the broader and narrower relations for associate come from Princeton University’s WordNet. Full sources and licences.