Definition

1. Noun:
   • The number represented by a one followed by twelve zeros (1,000,000,000,000): This is the cardinal number equal to 10^12.
   • A very large, indefinite number: Used informally to signify an extremely large quantity.

Usage

• Numerical Value: Used in contexts requiring large-scale quantification, such as finance, astronomy, demographics, and data storage.
• Informal Hyperbole: Used in everyday speech to emphasize an enormous, often uncountable, amount.

Examples

• Numerical Value:
  • The national debt is measured in trillions of dollars.
  • A light-year is about 9.46 trillion kilometers.
• Informal Hyperbole:
  • I've told you a trillion times to clean your room!
  • There were a trillion stars visible in the night sky.

Advanced Usage

• "Trillions of...": Used to describe a number in the trillions, often emphasizing vastness.
  • The human body contains trillions of cells.
• "A trillion and one": An informal expression meaning a very large number of things to do or consider.
  • I have a trillion and one things to finish before the deadline.

Variants and Related Words

• Trillionth (ordinal number & noun): Constituting number one trillion in a sequence; one of a trillion equal parts.
  • She was the trillionth visitor to the website.
  • A trillionth of a second is an incredibly short time.

Synonyms

• 10^12: The mathematical expression.
• One trillion: The written form.
• (Informal) Gazillion / Zillion: Other informal words for an indeterminately large number.

Notes on Regional Usage

• In the United States and increasingly in global finance and science, one trillion means 1,000,000,000,000 (10^12).
• Historically in the United Kingdom, this number was called a "billion", while "trillion" meant 10^18. The U.S. meaning (10^12) is now standard in British English for most modern contexts, especially in economics, though the historical usage may occasionally be seen.

Noun

1. 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
2. the number that is represented as a one followed by 12 zeros
   • in England they call a trillion a billion