| billion | (n) 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. one million million, 1000000000000 |
| trillion | (n) the number that is represented as a one followed by 18 zeros, Syn. one million million million |
| trillion | (n) the number that is represented as a one followed by 12 zeros, Syn. one million million, 1000000000000 |