1000000000000 n 1: the number that is represented as a one followed by 12 zeros; "in England they call a trillion a billion" [syn: {trillion}, {one million million}, {1000000000000}] 2: 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 [syn: {billion}, {one million million}, {1000000000000}]