The action of defending or protecting from attack, danger, or injury.
A noun "defense" represents anything employed to oppose attacks, including the strategy and tactics used to prevent the other team from scoring in team sports, as well as the portion of a team dedicated to preventing the other team from scoring.
A noun "defense" represents an argument in support or justification of something, the case presented by the defendant in a legal proceeding, or the lawyer or team who presents such a case.
(government, military, euphemistic) Government policy or (infra)structure related to the military.
(obsolete) A prohibition; a prohibitory ordinance.