Meaning of IMPEDANCE in English

noun Date: 1886 something that impedes ; hindrance : as, the apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective current, the ratio of the pressure to the volume displacement at a given surface in a sound-transmitting medium

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.