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English definition of “billion”

billion

noun [C]     /ˈbɪl.jən/
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.Cardinal numbers, including nought and zero UK old-fashioned 1,000,000,000,000 Note: This number is now called a trillion.Cardinal numbers, including nought and zero billions of sth informal a very large number: There were billions of flies everywhere.Cardinal numbers, including nought and zero
(Definition of billion noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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