Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “billionaire”


noun [C]     /ˌbɪl.jəˈneər/ US  /-ˈner/
a person who has money , property , etc. that is worth at least 1,000,000,000 dollars , pounds , euros , etc.Wealthy people
(Definition of billionaire noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of billionaire

Definitions of “billionaire” in other dictionaries

Translations of “billionaire”

Word of the Day


to pour liquid slowly over something, especially in a thin line or in small drops

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