Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential

Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. The capacitance is usually defined as the total electric charge placed on the object divided by the potential of the object:
$C = \frac{Q}{V}$
or, according to Gauss's law, the capacitance can be expressed as the electric flux per volt
$C = \frac{\Phi}{V}$
where
C is the capacitance in farads
Q is the charge in coulombs
V is the potential in volts
$Φ$ is the electric flux associated with the charge Q in coulombs

Source:Wikipedia