WordNet records no synonym and no antonym for meritocracy. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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 form of social system in which power goes to those with superior intellects
the belief that rulers should be chosen for their superior abilities and not because of their wealth or birth
Synonyms, antonyms and the broader and narrower relations for meritocracy come from Princeton University’s WordNet. Full sources and licences.