median has 3 distinct synonyms spread across 4 of its 4 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.
relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values)
“the median value of 17, 20, and 36 is 20”
dividing an animal into right and left halves
relating to or situated in or extending toward the middle
Synonyms, antonyms and the broader and narrower relations for median come from Princeton University’s WordNet. Full sources and licences.
the number midway between the two middle numbers in a series containing an even or odd number of items