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# billionth

adjective and noun (billionth, billionths)

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

## Everyday

1. Coming as number one billion in order (1,000,000,000th). [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/#m1)
2. One of a billion equal parts of something: 1/1,000,000,000. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/#m2)

### In the lessons

In maths, ordinal and fraction words. A nanometre is a billionth of a metre and a nanosecond is a billionth of a second. In news, «the billionth visitor» or «the billionth phone sold».

### Examples

- A nanosecond is a billionth of a second. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/#x1)
- The company celebrated its billionth customer. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/#x2)
- The world's billionth person was born in the 1800s. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/#x3)
- Write one billionth as a fraction: 1/1,000,000,000. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/#x4)
- Atoms are smaller than a billionth of a metre across. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/#x5)

### Note

Maths: a billion today means 1,000,000,000 (a thousand million) in the UK, USA and elsewhere; an old British meaning was a million million. A billionth = 1 ÷ 1,000,000,000 = 0.000000001.

## On Mova

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