(US, modern British & Australian, short scale) a thousand million (logic: 1,000 × 1,0002): 1 followed by nine zeros, 109; a milliard

(dated, British & Australian, long scale) A million million (logic: 1,000,0002): a 1 followed by twelve zeros; 1012

(colloquial, hyperbolic) An unspecified very large number.