meter-kilogram-second
adjective
me·ter-ki·lo·gram-sec·ond ˈmē-tər-ˈki-lə-ˌgram-ˈse-kənd 
: of, relating to, or being a system of units using the meter, kilogram, and second as its base units —abbreviation mks
Note: The meter-kilogram-second system of units has largely been replaced with the International System of Units, which uses many of the same fundamental quantities to derive its units but is more rigorously defined and overseen.
Word History
First Known Use
1888, in the meaning defined above
Medical Definition
meter-kilogram-second
adjective
variants or chiefly British metre-kilogram-second also metre-kilogramme-second
: mks