\Con`duc*tiv"i*ty\
(k[o^]n`d[u^]k*t[i^]v"[i^]*t[y^]), n.
The quality or power of conducting, or of receiving and
transmitting, as heat, electricity, etc.; as, the
conductivity of a nerve.

{Thermal conductivity} (Physics), the quantity of heat that
   passes in unit time through unit area of a plate whose
   thickness is unity, when its opposite faces differ in
   temperature by one degree.