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In telecommunication, the term input has the following meanings:

  1. In a device, process, or channel, a point that accepts data.
  2. A state, or a sequence of states, of a point that accepts data.
  3. A stimulus, such as a signal or interference, that enters a functional unit, such as a telecommunications system, a computer, or a computer program.

Source: from Federal Standard 1037C

See also: output, input/output