Definition of irregular adjective from the Oxford Advanced American Dictionary

     

    irregular

     adjective
    adjective
    NAmE//ɪˈrɛɡyələr//
     
     
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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 behavior 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 opposite regular
  6. irregularly
     
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  7.  
    adverb
See the Oxford Advanced Learner's Dictionary entry: irregular

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