American English

Definition of billionaire noun from the Oxford Advanced American Dictionary

 

billionaire

 noun
noun
NAmE//ˌbɪlyəˈnɛr//
 
, NAmE//ˈbɪlyəˌnɛr//
 
 
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an extremely rich person, who has at least a thousand million dollars, etc. in money or property a Texas billionaire
See the Oxford Advanced Learner's Dictionary entry: billionaire