A measurement of the metric system, equal to about 39.5 in.
The SI unit of length that is equal to 39.37 inches. It is formally defined as 1,650,763.73 wavelengths of the radiation corresponding to the transition between the levels 2p10 and 5ds of the isotope krypton-86.
A linear standard of measurement in the Systeme International d’ Unites (SI system) that is equal to about 39.37 inches. Also spelled metre in certain European countries.