noun (n)

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

  Synonym:
  defence mechanism, defence reaction, defense, defense mechanism, defense reaction
  

  source: wordnet30
• (sports) the team that is trying to prevent the other team from scoring(noun.group)

  Synonym:
  defending team, defense
  Antonym:
  offence, offense
  

  source: wordnet30
• the defendant and his legal advisors collectively(noun.group)

  Synonym:
  defense, defense lawyers, defense team
  Antonym:
  prosecution
  

  source: wordnet30
• an organization of defenders that provides resistance against attack(noun.group)

  Synonym:
  defence force, defense, defense force
  

  source: wordnet30
• the speech act of answering an attack on your assertions(noun.communication)

  Synonym:
  defense, refutation
  

  source: wordnet30
• the justification for some act or belief(noun.communication)

  Synonym:
  defense, vindication
  

  source: wordnet30
• a structure used to defend against attack(noun.artifact)

  Synonym:
  defense, defensive structure
  

  source: wordnet30
• a defendant's answer or plea denying the truth of the charges against him(noun.act)

  Synonym:
  defense, demurrer, denial
  Antonym:
  criminal prosecution, prosecution
  

  source: wordnet30
• (military) military action or resources protecting a country against potential enemies(noun.act)

  Synonym:
  defense, defensive measure
  

  source: wordnet30
• protection from harm(noun.act)

  source: wordnet30
• the act of defending someone or something against attack or injury(noun.act)

  source: wordnet30
• See Defense.(noun)

  source: webster1913