Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

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)
What is the pronunciation of irregular?
Add Cambridge dictionaries to your browser to your website

Definitions of “irregular” in other dictionaries

Word of the Day

workmanship

the skill with which something was made or done

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More