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Adjective
1. denoting a quantity consisting of one million million items or units in Great Britain
(synonym) billion
(similar) cardinal
(classification) United Kingdom, UK, Great Britain, GB, Britain, United Kingdom of Great Britain and Northern Ireland
2. denoting a quantity consisting of one thousand million items or units in the United States
(synonym) billion
(similar) cardinal
(classification) United States, United States of America, America, US, U.S., USA, U.S.A.

The following video provides you with the correct English pronunciation of the word "a billion", to help you become a better English speaker.