Definition of reductionism noun from the Oxford Advanced American Dictionary

 

reductionism

 noun
noun
NAmE//rɪˈdʌkʃəˌnɪzəm//
 
[uncountable](formal)(often disapproving)
 
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the belief that complicated things can be explained by considering them as a combination of simple parts
reductionist
 
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NAmE//rɪˈdʌkʃənɪst//
 
adjective, noun He was a reductionist who believed that everything could be explained in materialistic terms.
See the Oxford Advanced Learner's Dictionary entry: reductionism