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English definition of “irregular”

irregular

adjective uk   /ɪˈreɡ.jə.lər/ us    /-lɚ/

irregular adjective (RULE)

formal (of behaviour or actions) not according to usual rules or what is expected: Releasing the goods without an invoice is most irregular.Wrong B1 specialized language An irregular verb, noun, adjective, etc. does not obey the usual rules for words in the language.Linguistic terms and linguistic style

irregular adjective (SHAPE)

B2 not regular in shape or form; having parts of different shapes or sizes: an irregular coastline irregular teethRough, irregular and uneven

irregular adjective (TIME/SPACE)

B2 not happening at regular times or not with regular spaces in between: an irregular heartbeat They met at irregular intervals.Frequency and regularity - general words US informal not emptying your bowels as often as you would usuallyDigestive disorders

irregular adjective (SOLDIER)

(of a soldier) fighting for a country but not as a member of its official armySoldiers and people who fight in wars
irregularly
adverb uk   /-li/ us  
irregularly shaped The verb acts irregularly.Rough, irregular and unevenLinguistic terms and linguistic styleFrequency and regularity - general words

irregular

noun [C] uk   /ɪˈreɡ.jə.lər/ us    /-lɚ/
a soldier who is not a member of the official army of a countrySoldiers and people who fight in wars
(Definition of irregular from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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