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

     

    irregular

     adjective
    adjective
    BrE BrE//ɪˈreɡjələ(r)//
     
    ; NAmE NAmE//ɪˈreɡjələr//
     
     
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  1. 1not arranged in an even way; not having an even, smooth pattern or shape synonym uneven irregular teeth an irregular outline
  2. 2not happening at times that are at an equal distance from each other; not happening regularly irregular meals an irregular heartbeat irregular attendance at school He visited his parents at irregular intervals.
  3. 3not normal; not according to the usual rules synonym abnormal an irregular practice His behaviour is highly irregular.
  4. 4 (grammar) not formed in the normal way an irregular verb
  5. 5(of a soldier, etc.) not part of a country’s official army
  6. opposite regular
    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’).Extra examples The cells are slightly irregular in shape. some somewhat irregular business practices A combination of irregular meals and insufficient sleep was to blame. He visited his parents at irregular intervals. This stuff’s great for renovating uneven, irregular surfaces.
See the Oxford Advanced American Dictionary entry: irregular

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