Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “reduce”


verb [T]     /rɪˈdjuːs/
B1 to make something less: to reduce air pollution Prices have been reduced by almost 50 percent . The number of employees was reduced from 500 to 300.Becoming and making smaller or lessBecoming and making less strong
to add one or more electrons to a substance or to remove oxygen from a substance Physical and chemical processes
(Definition of reduce verb from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “reduce” in other dictionaries

Word of the Day


a situation in which two people are friends

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