adjective ir·reg·u·lar \i-ˈre-gyə-lər, ˌi(r)-\

: not normal or usual : not following the usual rules about what should be done

: not even or smooth : not regular in form or shape

: happening or done at different times that change often

Full Definition of IRREGULAR

a :  not being or acting in accord with laws, rules, or established custom <irregular conduct>
b :  not conforming to the usual pattern of inflection <irregular verbs>; specifically :  strong 16
c :  not following a usual or prescribed procedure; especially British :  celebrated without either proclamation of the banns or publication of intention to marry <irregular marriage>
:  not belonging to or a part of a regular organized group; specifically :  not belonging to a regular army but raised for a special purpose <irregular troops>
a :  lacking perfect symmetry or evenness <an irregular coastline>
b :  having one or more floral parts of the same whorl different in size, shape, or arrangement; specifically :  zygomorphic
:  lacking continuity or regularity especially of occurrence or activity <irregular employment>
ir·reg·u·lar·ly adverb

Examples of IRREGULAR

  1. His behavior as a teacher was highly irregular.
  2. Her application was handled in an irregular manner.
  3. a very jagged, irregular surface
  4. The stone has an irregular shape.
  5. He has a very irregular schedule.
  6. The festival has been held at irregular intervals.


Middle English irreguler, from Anglo-French, from Late Latin irregularis not in accordance with rule, from Latin in- + regularis regular
First Known Use: 14th century

Synonym Discussion of IRREGULAR

irregular, anomalous, unnatural mean not conforming to rule, law, or custom. irregular implies not conforming to a law or regulation imposed for the sake of uniformity in method, practice, or conduct <concerned about his irregular behavior>. anomalous implies not conforming to what might be expected because of the class or type to which it belongs or the laws that govern its existence <her drive made her an anomalous figure in a sleepy organization>. unnatural suggests what is contrary to nature or to principles or standards felt to be essential to the well-being of civilized society <prisoners treated with unnatural cruelty>.



: a soldier who does not belong to a country's official army

Full Definition of IRREGULAR

:  one that is irregular: as
a :  a soldier who is not a member of a regular military force
b plural :  merchandise that has minor defects or that falls next below the manufacturer's standard for firsts

First Known Use of IRREGULAR

15th century
IRREGULAR Defined for Kids


adjective ir·reg·u·lar \i-ˈreg-yə-lər\

Definition of IRREGULAR for Kids

:  not following custom or rule <Her methods are most irregular.>
:  not following the usual manner of inflection <The verb “sell” is irregular because its past tense is “sold,” not “selled.”>
:  not straight, smooth, or even <an irregular coastline>
:  not continuous or coming at set times <He works irregular hours.>
ir·reg·u·lar·ly adverb
Medical Dictionary


adjective ir·reg·u·lar \(ˈ)ir-ˈ(r)eg-yə-lər\

Medical Definition of IRREGULAR

:  lacking perfect symmetry of form :  not straight, smooth, even, or regular <irregular teeth>
a :  lacking continuity or regularity of occurrence, activity, or function <irregular breathing> b of a physiological function :  failing to occur at regular or normal intervals <irregular menstruation> <have your bowels been irregular> c of an individual :  failing to defecate at regular or normal intervals <was constipated and very irregular>
ir·reg·u·lar·ly adverb


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