Definition of "defense system" []

• The weaponry available for the defense of a region (noun)

WordNet. Princeton University. 2010.

• "The result was inevitable: military and psychological stultification, and an increasing pilot and aircraft loss rate as Moscow helped Hanoi to establish the most sophisticated air defense system ever tested in war — a far-flung complex of missiles, ground guns, interceptors, radar, and communications and control centers."
• "Over the weekend, a test of our “hit-to-kill” missile defense system succeeded over the Pacific, providing an excellent backdrop to the Bush-Putin meeting in Genoa."