Definition of irreducible adjective from the Oxford Advanced Learner's Dictionary

 

irreducible

 adjective
adjective
BrE BrE//ˌɪrɪˈdjuːsəbl//
 
; NAmE NAmE//ˌɪrɪˈduːsəbl//
 
(formal)
 
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that cannot be made smaller or simpler to cut staff to an irreducible minimum an irreducible fact
See the Oxford Advanced American Dictionary entry: irreducible