1.Noun(In the SI system of units) Any unit derived from one of the seven base units of length (meter), mass (kilogram), time (second), electric current (ampere), thermodynamic temperature (kelvin), amount of substance (mole) and luminous intensity (candela).
"The derived unit of electrical resistance (ohm) is derived from length, mass, time, and electric current."
2.NounEquivalently, in any coherent unit system, a unit derived from one or more base units.