Meaning of billion

Definition of billion

(adj) 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
(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); "there were millions of flies"
the number that is represented as a one followed by 9 zeros

Other information on billion

WIKIPEDIA results for billion
Amazon results for billion