1. the number 1,000,000,000,000 (one million million)
Usage: American system
2. the number 1,000,000,000,000,000,000 (one million million million)
Usage: British system; archaic
3. an extremely large number or amount
Usage: informal

1. amounting to one trillion in number

Examples

• The national debt exceeded two trillion dollars.
• Scientists estimate there are trillions of stars in the galaxy.
• The company’s market value reached one trillion dollars.
• I’ve told you a trillion times to clean your room.
• The government allocated trillion-dollar funding for infrastructure.
• There are trillions of bacteria in the human body.
• The data center processes trillions of calculations per second.