What is the meaning of Impedance?

The act of impeding; that which impedes; a hindrance.

A measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, and inductive and capacitive reactances; the ratio of voltage to current treated as complex quantities.

A quantity analogous to electrical impedance in some other energy domain

  1. a measure of opposition to motion of something subjected to a force; the ratio of force to velocity treated as complex quantities.
  2. the ratio of sound pressure to volume flow rate treated as complex quantities.

a measure of opposition to motion of something subjected to a force; the ratio of force to velocity treated as complex quantities.

the ratio of sound pressure to volume flow rate treated as complex quantities.

Source: wiktionary.org