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# millimetre

«millimetre» in Mova's school dictionary: **a small unit of length; there are 10 millimetres in a…** — its meaning for a pupil, its sense in the lessons and examples, with 5 sentences of Mova's corpora that use it.

### part of speech

noun (a millimetre, millimetres); millimeter (US)

### meaning for a pupil

A millimetre is a small unit of length; there are 10 millimetres in a centimetre and 1,000 in a metre. It is written mm. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#m1)

### sense in the lessons

In maths and science pupils measure small lengths in millimetres with a ruler: the width of a fingernail, rainfall in a rain gauge. Converting units: mm to cm to m. Phrases: to the nearest millimetre, millimetres of rain.

### examples

- A millimetre is about the thickness of a credit card. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#x1)
- Measure the line to the nearest millimetre. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#x2)
- 10 millimetres make 1 centimetre. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#x3)
- We had 25 millimetres of rain today. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#x4)
- The ant is 6 mm long. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#x5)
- 35 mm = 3.5 cm. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#x6)
- The gap was only a millimetre wide. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#x7)
- A metre has 1,000 millimetres. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/M/millimetre/#x8)

### note

UK, Canada, Australia, NZ, Ireland spell "millimetre"; USA spells "millimeter". Symbol mm (no s, no full stop). "Milli-" means one thousandth. Maths: mm ÷ 10 = cm; mm ÷ 1,000 = m; cm × 10 = mm. Trap: do not mix up mm with ml (millilitre, for volume).

### In the corpora

- [A metre is 100 centimetres, and a centimetre is 10 millimetres.](https://md.mova.elamur.ai/free/en/corpora/school/lessons/247-metres-centimetres-and-millimetres/0/)
- [Squeeze the whole Earth down to the size of a marble, about 9 millimetres across, and it would become a black hole.](https://md.mova.elamur.ai/free/en/corpora/school/space/25-black-holes/2/)
- [To become a black hole, Earth would have to be squeezed to about 9 millimetres across, about the size of a marble.](https://md.mova.elamur.ai/free/en/corpora/school/space/25-black-holes/13/)
- [A desert gets less than about 250 millimetres of rain a year.](https://md.mova.elamur.ai/free/en/corpora/school/world/66-deserts-rainforests-grasslands/1/)
- [A desert gets less than about 250 millimetres of rain a year.](https://md.mova.elamur.ai/free/en/corpora/school/world/66-deserts-rainforests-grasslands/11/)

### Trees and pragmatics

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