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English definition of “irregular”

irregular

adjective     /ɪˈreɡjələr/
TIME B2 Irregular actions or events happen with a different amount of time between each one: an irregular heartbeat They met at irregular intervals.Frequency and regularity - general words
SHAPE B2 not smooth or straight, or having parts that are different sizes: an irregular coastlineRough, irregular and uneven
GRAMMAR B1 not following the general rules in grammar: irregular verbs/pluralsVerb forms, tenses and types of verbs
BEHAVIOUR UK formal slightly illegal, or not done in the usual and acceptable way: He led a very irregular life.Wrong
irregularity     /ɪˌreɡjəˈlærəti/ noun [C, U] irregularly adverb
(Definition of irregular adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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