adjective \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


adjective \(ˈ)ir-ˈ(r)eg-yə-lər\   (Medical Dictionary)

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


Next Word in the Dictionary: irregular carrier
Previous Word in the Dictionary: irregenerate
All Words Near: irregular

Seen & Heard

What made you want to look up irregular? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More