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# billionth

«billionth» in Mova's school dictionary: **Coming as number one billion in order (1,000,000,000th)** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

adjective and noun (billionth, billionths)

### meaning for a pupil

1) Coming as number one billion in order (1,000,000,000th). [tree →](https://md.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://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/#m2)

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

### Trees and pragmatics

[Every meaning and example of «billionth» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/B/billionth/), each sentence with its dependency tree and frames.