1. the number 1,000,000,000,000,000 (one thousand trillion) in the US system
Usage: US numbering system
2. the number 1,000,000,000,000,000,000,000,000 (one million trillion) in the British system
Usage: British numbering system; less common

Examples

• The national debt reached over one quadrillion dollars.
• Scientists estimate there are quadrillions of stars in the observable universe.
• The computer can perform quadrillions of calculations per second.
• A quadrillion is a number so large it’s hard to comprehend.
• The data storage capacity was measured in quadrillions of bytes.
• Economic models predicted quadrillions in future spending.