@wikipedia

Amount of heat to be supplied to a given amount of a material with the constant volume to produce a unit change in its temperature:

Isochoric Heat Capacity   $//<![CDATA[ \begin{array}{l}C_V\end{array} //]]>$ is proportional to the amount of the matter involved in a Heat Transfer process and as such is not a material property.

One can relate it to material properties through the known material mass   $//<![CDATA[ \begin{array}{l}m\end{array} //]]>$ or a material volume  $//<![CDATA[ \begin{array}{l}V\end{array} //]]>$:

See also

Physics / Thermodynamics / Thermodynamic process / Heat Transfer / Heat Capacity / Heat Capacity

[ Heat ] [ Isobaric heat capacity ] 

[ Specific heat capacity ] [ Volumetric Heat Capacity ]