Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “reg.”


(also reg)     informal
written abbreviation for registration: I needed to know the reg. number of the car .
written abbreviation for registered: The company has charitable status , reg charity no 805231.
(Definition of reg. from the Cambridge Business English Dictionary © Cambridge University Press)
Focus on the pronunciation of reg.

Word of the Day


relating to behaviour between people that is pleasant and friendly, often despite a difficult situation

Word of the Day


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