Quick definitions from Macmillan ( )

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Quick definitions from WordNet (defense)

▸ noun:  protection from harm ("Sanitation is the best defense against disease")
▸ noun:  military action or resources protecting a country against potential enemies ("They died in the defense of Stalingrad")
▸ noun:  a defendant's answer or plea denying the truth of the charges against him ("He gave evidence for the defense")
▸ noun:  the justification for some act or belief ("He offered a persuasive defense of the theory")
▸ noun:  an organization of defenders that provides resistance against attack ("He joined the defense against invasion")
▸ noun:  the defendant and his legal advisors collectively ("The defense called for a mistrial")
▸ noun:  (sports) the team that is trying to prevent the other team from scoring ("His teams are always good on defense")
▸ noun:  a structure used for defense ("The artillery battered down the defenses")
▸ noun:  the speech act of answering an attack on your assertions ("In defense he said the other man started it")
▸ noun:  the federal department responsible for safeguarding national security of the UnitedStates; created in 1947
▸ noun:  (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires

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▸ Word origin