The base unit is the meter. Larger and smaller units based on the meter are also used, for example downward: millimeter, micrometer (a.k.a. "micron"), nanometer; and upward: the kilometer. Larger units like megameter and gigameter could be used, but they are seldom used in practice.
The metre.
The base unit for length is the metre.
In the metric system, meters are the base unit to measure length.
The metric unit of length is the 'meter'.
The base unit for length is the metre.
The official system of measurements is the SI; it has SEVEN base units.
The base unit for length is the metre.
In the metric system, meters are the base unit to measure length.
The metric unit of length is the 'meter'.
the base unit of length is the metre.
The base unit for length is the metre.
The basic metric unit of measure for length is the meter (m).
The base unit for length is the metre.
The SI, or metric, base unit for length is the metre.
The metric unit is the meter scaled to centimeters.
The base measurement for length is a meter.
The official system of measurements is the SI; it has SEVEN base units.
The base unit of length is the metre.