Definition of irreducible adjective from the Oxford Advanced American Dictionary

 

irreducible

 adjective
adjective
NAmE//ˌɪrɪˈdusəbl//
 
(formal)
 
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that cannot be made smaller or simpler to cut staff to an irreducible minimum an irreducible fact
irreducibly
 
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NAmE//ˌɪrɪˈdusəbli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: irreducible