defense (American English) and defence (British English and Canadian English) can refer to any of the following:

• For defense of a doctoral dissertation see Thesis committee
• For the military term see defense (military)
• civil defense measures and emergency preparedness
• In politics, defense may be a euphemism for war. See, for example, the United States Department of Defense.
• For legal defense see defense (legal)
• For defense in sport see defense (sport)

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