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

irregular

noun
 
/ɪˈreɡjələ(r)/
 
/ɪˈreɡjələr/
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  1. a soldier who is not a member of a country’s official army
    Word Originlate 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 irregular in the Oxford Advanced American Dictionary
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