Question

What meaning would you give to the capacity of a single conductor?

Answer 1

for a single conductor the capacity represents its ability to hold maximum possible amount of charge and it is measured as the ratio of charged given to the electric potential acquired by a conductor 
ie., C = q / V

Answer 2

Explanation:

Capacitance of a single conductor means its capability to hold charge with respect to another conductor situated at infinity and maintained at zero potential.