One thousandth of a metre-milli means 1000 in latin, a language spoken long ago by the ancient romans. units of measurement such as centimetre, kilometre, each have a prefix that explains what they mean. For example, millimetre literally means 1000 pieces of a metre. Prefix symbol value example meaning milli m one thousandth of 1 mm 1 millimetre centi c one hundredth of 1 cm 1 centimetre deci d one tenth of 1 db 1 decibel kilo k 1000 times 1 kg 1 kilogram.
