Definition of "Defense" :

noun: the act of defending someone or something against attack or injury

"A good boxer needs a good defense."

noun: protection from harm

"Sanitation is the best defense against disease."

noun: (military) 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: a structure used to defend against attack

"The artillery battered down the defenses."

noun: the justification for some act or belief

"He offered a persuasive defense of the theory."

noun: the speech act of answering an attack on your assertions

"In defense he said the other man started it."

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: the federal department responsible for safeguarding national security of the United States; created in 1947

noun: (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires