partition has 8 distinct synonyms spread across 4 of its 6 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.
(computer science) the part of a hard disk that is dedicated to a particular operating system or application and accessed as a single unit
the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart
divide into parts, pieces, or sections
“The Arab peninsula was partitioned by the British”
separate or apportion into sections
“partition a room off”
Synonyms, antonyms and the broader and narrower relations for partition come from Princeton University’s WordNet. Full sources and licences.