billion - noun

the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen

a very large indefinite number (usually hyperbole)

the number that is represented as a one followed by 9 zeros

billion - adjective

• denoting a quantity consisting of one thousand million items or units in the United States
• denoting a quantity consisting of one million million items or units in Great Britain

billion - thesaurus

gazillion   jillion   million   trillion   zillion