"Impedance is the analogue of the resistance or resistivity when applied to alternating current. That is, it is a measure of a material's inability to carry the electrical current. In many materials, the impedance varies as the frequency of the applied electrical potential changes, due to the properties of the liquid or solid. In electrochemistry, the impedance of the electrode reaction is also frequency dependent. "
Meaning of IMPEDANCE in English
Electrochemistry English dictionary. Английский словарь электрохимии. 2012