irregular Definition in Cambridge British English Dictionary
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Definition of "irregular" - British English Dictionary

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irregularadjective

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.B1 specialized language An irregular verb, noun, adjective, etc. does not obey the usual rules for words in the language.
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irregular adjective (SHAPE)

B2 not regular in shape or form; having parts of different shapes or sizes: an irregular coastline irregular teeth

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. US informal not emptying your bowels as often as you would usually

irregular adjective (SOLDIER)

(of a soldier) fighting for a country but not as a member of its official army
irregularly
adverb uk   us   /-li/
irregularly shaped The verb acts irregularly.

irregularnoun [C]

uk   /ɪˈreɡ.jə.lər/  us   /-lɚ/
a soldier who is not a member of the official army of a country
(Definition of irregular from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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