The meter.
The standard unit of length in the metric system is called the meter. The standard unit of mass is the kilogram.
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).
The metric unit of length is the 'meter'.