resistance against attack; protection: Two more regiments are needed for the defense of the city.
something that defends, as a fortification, physical or mental quality, or medication: This fort was once the main defense of the island.
the defending of a cause or the like by speech, argument, etc.: He spoke in defense of the nation's foreign policy.
a speech, argument, etc., in vindication: She delivered a defense of free enterprise.
Law. the denial or pleading of the defendant in answer to the claim or charge that has been made. the proceedings adopted by a defendant, or the defendant's legal agents, for defending against the charges that have been made. a defendant and his or her counsel.