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# quadrillion

noun (a quadrillion, quadrillions); number

«quadrillion» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. A quadrillion is the number 1,000,000,000,000,000: a thousand trillion, a 1 followed by 15 zeros. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/#m1)
2. (informal) It can mean a huge number. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/#m2)

### In the lessons

In maths lessons on place value and big numbers: million (6 zeros), billion (9), trillion (12), quadrillion (15). In science it describes huge counts, like ants on Earth. Phrases: a quadrillion dollars.

### Examples

- A quadrillion has fifteen zeros. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/#x1)
- There may be about twenty quadrillion ants on Earth. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/#x2)
- A quadrillion is a thousand trillions. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/#x3)
- I've told you a quadrillion times! [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/#x4)
- Computers can do a quadrillion sums a second. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/#x5)
- Write one quadrillion in digits: 1,000,000,000,000,000. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/#x6)

### Note

In maths: 1 quadrillion = 10^15 = 1,000 trillion. In the old British system it meant 10^24, but today almost everyone uses 10^15. After a number, no -s: «two quadrillion».

## On Mova

- [Trees and pragmatics of «quadrillion» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/Q/quadrillion/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«quadrillion» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/quadrillion.html) on Mova free.