Related to Measurement:
* Micro-: meaning one millionth (micrometer)
* Milli-: meaning one thousandth (millimeter)
* Centi-: meaning one hundredth (centimeter)
* Deci-: meaning one tenth (decimeter)
* Kilo-: meaning one thousand (kilometer)
* Mega-: meaning one million (megameter)
* Giga-: meaning one billion (gigameter)
Other Prefixes:
* Chrono-: meaning time (chronometer)
* Photo-: meaning light (photometer)
* Audio-: meaning sound (audiometer)
* Thermo-: meaning heat (thermometer)
* Hydr-: meaning water (hydrometer)
* Baro-: meaning pressure (barometer)
* Speedo-: meaning speed (speedometer)
* Od-: meaning distance (odometer)
The specific prefix you choose will depend on the context and what you are trying to measure.