defense in depth

Definition of defense in depth

  1. 1 :  a tactical system of mutually supporting positions that are each capable of all-round defense and that have sufficient depth to prevent the enemy from achieving freedom of maneuver before the enemy's attack is broken up and absorbed

  2. 2 :  a strategic succession of defended areas which will permit continuation of a war after forward areas have been lost

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the point at which something begins

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