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|Noun||1.||defensive measure - (military) military action or resources protecting a country against potential enemies; "they died in the defense of Stalingrad"; "they were developed for the defense program"|
umbrella - a formation of military planes maintained over ground operations or targets; "an air umbrella over England"
air defense - defensive measures designed to destroy attacking enemy aircraft or missiles or to nullify their effectiveness
stand - a defensive effort; "the army made a final stand at the Rhone"
hasty defence, hasty defense - a defense organized while in contact with the enemy or when time is limited
deliberate defence, deliberate defense - a defense organized before contact is made with the enemy and while time for organization is available; usually includes a fortified zone (with pillboxes) and communication systems
biodefence, biodefense, biological defence, biological defense - procedures involved in taking defensive measures against attacks using biological agents
chemical defence, chemical defense - procedures involved in taking defensive measures against attacks using chemical agents
minelaying, mining - laying explosive mines in concealed places to destroy enemy personnel and equipment
biological warfare defence, biological warfare defense, BW defence, BW defense - defense against biological warfare