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WordNet records no synonym and no antonym for chain reaction. 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 series of chemical reactions in which the product of one is a reactant in the next
a self-sustaining nuclear reaction; a series of nuclear fissions in which neutrons released by splitting one atom leads to the splitting of others
Synonyms, antonyms and the broader and narrower relations for chain reaction come from Princeton University’s WordNet. Full sources and licences.