capacitance Syllabification: (ca·pac·i·tance)Pronunciation: /kəˈpasitəns/Definition of capacitance noun Physics the ability of a system to store an electric charge. the ratio of the change in an electric charge in a system to the corresponding change in its electric potential. (Symbol: C)Origin: late 19th century: from capacity + -ancecapacitance in other Oxford dictionaries Definition of capacitance in the British & World English dictionary