disturbance
  • noun an alteration in the usual condition of something
  • noun a change in an ecosystem caused by an alteration of the environmental conditions, by a process such as drought, pollution or felling of woodland
  • An undesired interference, interruption, or variation in a condition, quantity, or process. For instance, noise which interferes with the transmission or reception of a signal.
  • In a control system, an unwanted control signal.

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