Main entry: one thousand million, 1000000000, billion
Definition: the number that is represented as a one followed by 9 zeros
Main entry: one million million, billion, 1000000000000
Definition: 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
Main entry: million, trillion, gazillion, billion, zillion, jillion
Definition: a very large indefinite number (usually hyperbole)
Usage: there were millions of flies
Main entry: billion
Definition: denoting a quantity consisting of one thousand million items or units in the United States
Main entry: billion
Definition: denoting a quantity consisting of one million million items or units in Great Britain