• The forming of a block.
  • The stopping or impeding of passage or movement. For instance, to block a current flow.
  • The use of an unwanted signal to overload a receiver, so that the automatic gain control reduces the response to the desired signal.
  • The inability of a telecommunications system to connect calls, usually due to the available resources being completely occupied.
  • The preventing of viewing TV programming deemed inappropriate, undesirable, or in another way unwanted. For instance, a V-chip may be programmed to perform this function.

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