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.
Milimetres, centimetres, metres and kilometres
The meter / metre. (m)
Defined as 1/299,792,458 of the distance that light travels
through vacuum in one second.
Meter
meter [m]
The standard unit is the meter (metre). It is equal to about 39.37 inches.
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 metric standard unit of mass is the kilogram (Kg).
The metric unit of length 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 meter.
he standard unit of length in the metric system is the meter
That is the important "metre".
" meter "
metres (or meters if you're amercian!)
The standard unit is the meter (metre). It is equal to about 39.37 inches.
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.
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 metric unit of time is a second (s).
The metric standard unit of mass is the kilogram (Kg).