it means what's the unit you use to measure distance or length.
Eg, you have a piece of string and you want to measure it. You take the ruler and you simply measure it. Then you say the length of the string is X inches, or X feet. Here the inch and feet are units of length.
Outside the US, the standard unit for length is meters. US uses both the metric and the imperial system. So in the US the standard unit for length could be yards, feet, inch, etc.
The standard unit is the meter (metre). It is equal to about 39.37 inches.
The standard unit for measuring length and distance is the meter (m) in the metric system.
The metre (spelled meter also)
The meter, which is defined, as of 1983, as the length of the path traveled by light in a vacuum in an interval of 1/299792458 seconds. This is a Systeme Internationale standard measurement.
The standard unit of length in the metric system is the meter: 1 millimeter = 0.001 meter 1 centimeter = 0.01 meter 1 decimeter = 0.1 meter 1 kilometer = 1000 meters
The standard unit of measure for length in the metric system is the meter.
The standard unit of length in the metric system is called the meter. The standard unit of mass is the kilogram.
The standard unit is the meter (metre). It is equal to about 39.37 inches.
The meter.
he standard unit of length in the metric system is the meter
The standard unit of measure for length in the metric system, known as the "ku," is the meter.
The standard unit for measuring length and distance is the meter (m) in the metric system.
That is the important "metre".
" meter "
metres (or meters if you're amercian!)
The metre (spelled meter also)
Probably that refers to expressing length in standard (metric) units, like meters, millimeters, and kilometers, instead of some non-standard (non-metric) unit like feet, or light-years.