Word Study
c. g. s.
CIDE DICTIONARY
c. g. s.,
An abbreviation for Centimeter, Gram, Second. -- applied to a system of units much employed in physical science, based upon the centimeter as the unit of length, the gram as the unit of weight or mass, and the second as the unit of time. [1913 Webster]
For further exploring for "c. g. s." in Webster Dictionary Online