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accession has 7 distinct synonyms spread across 4 of its 7 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.
a process of increasing by addition (as to a collection or group)
“the art collection grew through accession”
(civil law) the right to all of that which your property produces whether by growth or improvement
something added to what you already have
“the librarian shelved the new accessions”
the act of attaining or gaining access to a new office or right or position (especially the throne)
“Elizabeth's accession in 1558”
make a record of additions to a collection, such as a library
Synonyms, antonyms and the broader and narrower relations for accession come from Princeton University’s WordNet. Full sources and licences.