channel

noun
A length of water wider than a strait, joining two larger areas of water, especially two seas. (The bay includes saltmarsh, shallow and open water, tidal channels, mudflats and numerous islands, and a freshwater pond.)
A band of frequencies used in radio and television transmission, especially as used by a particular station. (Under this concept, multiple antennas simultaneously transmit different flows of data over one and the same radio channel and frequency band.)
A medium for communication or the passage of information. (they didn't apply through the proper channels)
An electric circuit which acts as a path for a signal. (an audio channel)
A tubular passage or duct for liquid. (fish eggs have a small channel called the micropyle)
A groove or furrow.