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reaction [reactions]▼(action in response to an event)noun[UK: rɪ.ˈæk.ʃn̩] [US: ri.ˈæk.ʃn̩]
chain reaction▼(type of nuclear reaction)noun[UK: tʃeɪn rɪ.ˈæk.ʃn̩] [US: ˈtʃeɪn ri.ˈæk.ʃn̩]
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