designating or of a system of measurement in which the meter, kilogram, and second are used as the units of length, mass, and time, respectively: abbrev. MKS
See meter-kilogram-second in American Heritage Dictionary 4
(mēˌtər-kĭlˌə-grăm-sĕkˈənd)
adjective Abbr. mks
Of or being a system of units for mechanics, using the meter, the kilogram, and the second as basic units of length, mass, and time.