Current

n.
  1. A flowing or passing; onward motion. Hence: A body of fluid moving continuously in a certain direction; a stream; esp., the swiftest part of it; as, a current of water or of air; that which resembles a stream in motion; as, a current of electricity.
  2. General course; ordinary procedure; progressive and connected movement; as, the current of time, of events, of opinion, etc.
    3. Current meter ,
    an instrument for measuring the velocity, force, etc., of currents.
    Current mill ,
    a mill driven by a current wheel.
    Current wheel ,
    a wheel dipping into the water and driven by the current of a stream or by the ebb and flow of the tide.