Definition of "defense" in English

noun

1. The action of defending or protecting from attack, danger, or injury.

2. Anything employed to oppose attack(s).

3. An argument in support or justification of something.

   • to come to someone's defense

4. (government, military, euphemistic) Government policy or (infra)structure related to the military.

   • Department of Defense

5. (obsolete) A prohibition; a prohibitory ordinance.

verb

1. (sports, chiefly US) To employ defensive tactics (so as to block).

verb

1. (now rare) To furnish with defenses; to defend, protect.