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English definition of “irregular”

irregular

adjective  /ɪˈreɡ·jə·lər/ us  

irregular adjective (SHAPE)

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

irregular adjective (TIME/SPACE)

not happening at regular times, or not having usual or regular spaces in between: There are irregular spaces between the words. He showed up at irregular intervals.

irregular adjective (RULE)

(of behavior or actions) not according to usual rules or what is expected grammar An irregular verb, noun, adjective, or other type of word does not obey the usual rules in the language for changing word endings.
(Definition of irregular from the Cambridge Academic Content Dictionary © Cambridge University Press)
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