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fission 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.
reproduction of some unicellular organisms by division of the cell into two more or less equal parts
a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
Synonyms, antonyms and the broader and narrower relations for fission come from Princeton University’s WordNet. Full sources and licences.