calibrate has 2 distinct synonyms spread across 1 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.
mark (the scale of a measuring instrument) so that it can be read in the desired units
“he calibrated the thermometer for the Celsius scale”
measure the caliber of
“calibrate a gun”
Synonyms, antonyms and the broader and narrower relations for calibrate come from Princeton University’s WordNet. Full sources and licences.