plurality has 5 distinct synonyms spread across 2 of its 3 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.
the state of being plural
“to mark plurality, one language may add an extra syllable to the word whereas another may simply change the vowel in the existing final syllable”
Synonyms, antonyms and the broader and narrower relations for plurality come from Princeton University’s WordNet. Full sources and licences.
(in an election with more than 2 options) the number of votes for the candidate or party receiving the greatest number (but less that half of the votes)