a very large indefinite number (usually hyperbole);
"there were millions of flies"
the number that is represented as a one followed by 18 zeros;
"in England they call a quintillion a trillion"
the number that is represented as a one followed by 12 zeros;
"in England they call a trillion a billion"
one quintillion in Great Britain
one million million in the United States
- The government spends a trillion on education annually.
- Barack Obama's first move as president was to borrow another trillion dollars to fund his stimulus package .
About two trillion dollars' worth of insurance.出自：New Yorker