Capacity

Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential. There are two closely related notions of capacitance: self capacitance and mutual capacitance.

In electrical circuits, the term capacitance is usually a shorthand for the mutual capacitance between two adjacent conductors, such as the two plates of a capacitor. However, for an isolated conductor, there also exists a property called self capacitance, which is the amount of electric charge that must be added to an isolated conductor to raise its electric potential by one unit (i.e. one volt, in most measurement systems).

Sources:

Harrington, Roger F. (2003). Introduction to Electromagnetic Engineering (1st ed.). Dover Publications.

William D. Greason (1992). Electrostatic discharge in electronics. Research Studies Press.