meditation has 1 distinct synonym spread across 1 of its 2 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.
continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature
“the habit of meditation is the basis for all real knowledge”
(religion) contemplation of spiritual matters (usually on religious or philosophical subjects)
Synonyms, antonyms and the broader and narrower relations for meditation come from Princeton University’s WordNet. Full sources and licences.