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English definition of “irregular”

irregular

adjective (RULE)    /ɪˈreɡ.jə.lər/ US  /-lɚ/
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 Grammar:Verbs: basic formsGrammar:Verbs: the three basic formsMain verbs have three basic forms: the base form, the past form and the -ed form (sometimes called the ‘-ed participle’):Grammar:Regular verbsMost verbs in English are regular. Regular verbs add -ing to the base form to make the -ing form, and -ed to the base form to make the past simple and the -ed form.Grammar:Irregular verbsIrregular verbs follow the same rules as regular verbs for the present simple but have different forms for the past simple and the -ed form. irregularly     /-li/ adverb irregularly shaped The verb acts irregularly.Rough, irregular and unevenLinguistic terms and linguistic styleFrequency and regularity - general words
(Definition of irregular adjective (RULE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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