Centimeter-gram-second Definition

sentəmētərgramsekənd, säntəmētərgramsekənd
Designating or of a system of measurement in which the centimeter, gram, and second are the units of length, mass, and time, respectively.
Webster's New World

(sciences) A system of units formerly used in physics (now replaced by the SI system), in which the basic units of length, mass and time were respectively centimeter, gram, and second. Abbreviated as cgs or CGS.