Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “real number”

real number

noun [C]  /ˈri·əl ˈnʌm·bər, ˈril/
mathematics a number that can represented using a number line (= drawing that represents all the numbers that exist)
(Definition of real number noun from the Cambridge Academic Content Dictionary © Cambridge University Press)

Word of the Day


physical activity that you do to make your body strong and healthy

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