- trillion, one million million million - the number that is represented as a one followed by 18 zeros; "in England they call a quintillion a trillion"
--1 is a kind of large indefinite quantity, large indefinite amount; large integer; large indefinite quantity, large indefinite amount; large integer
- trillion, one million million, 1000000000000 - the number that is represented as a one followed by 12 zeros; "in England they call a trillion a billion"
--2 is a kind of large integer; large integer