One meter equals the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second. It is the base unit in the International System of Units (SI).
2. Angstrom (Å):
The angstrom (swedish) is equal to 10−10 m or 0.1 nm.
3. The units of length commonly used in the U.K. and U.S.:
inch (2.54 cm)
foot (12 inches, 0.3048 m)
yard (3 ft, 0.9144 m)
mile (5280 ft, 1609.344 m)
league (3 miles)
4. Units used in marine:
fathom (for depth; only in non-metric countries) (2 yards = 1.8288 m)
nautical mile (one minute of arc of latitude = 1852 m)