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English definition of “billion”

billion

noun [C] uk   /ˈbɪl.jən/ us  
B2 the number 1,000,000,000: The population of China is over a/one billion. Cosmetics is a billion-dollar industry. The government has invested billions of dollars in the project. UK old-fashioned 1,000,000,000,000 Note: This number is now called a trillion. billions of sth informal a very large number: There were billions of flies everywhere.
(Definition of billion from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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