Definition of irregular noun from the Oxford Advanced Learner's Dictionary

 

irregular

 noun
noun
BrE BrE//ɪˈreɡjələ(r)//
 
; NAmE NAmE//ɪˈreɡjələr//
 
 
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a soldier who is not a member of a country’s official army Word Origin late Middle English (in the sense ‘not conforming to rule (especially that of the Church)’): via Old French from medieval Latin irregularis, from in- ‘not’ + regularis (from regula ‘rule’).
See the Oxford Advanced American Dictionary entry: irregular

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