Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “irregular”

See all translations

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

work out

to exercise in order to improve the strength or appearance of your body

Word of the Day

Byronic, Orwellian and Darwinian: adjectives from names.

by Liz Walter,
April 15, 2015
Becoming an adjective is a strange kind of memorial, but it is often a sign of a person having had real influence on the world. Science is full of examples, from Hippocrates, the Greek medic born around 460 BC, who gave his name to the Hippocratic Oath still used by doctors today,

Read More 

bio-inspiration noun

April 13, 2015
the adoption of patterns and structures found in nature for the purposes of engineering, manufacturing, science, etc. The MIT researchers actually aren’t the only robotics team to turn to cheetahs for bio-inspiration.

Read More