Defense or defence may refer to: Tactical, martial, and political acts or groups. Defense (military), forces primarily intended for warfare. Civil defense, the organizing of civilians to deal with emergencies or enemy attacks. Defense industry, industry which manufactures and sells weapons and military technology. Self-defense, the use of force to defend oneself. Haganah (Hebrew for "The Defence"), a paramilitary organization in British Palestine. National security, security of a nation state, its citizens, economy, and institutions, as a duty of government.
https://en.wikipedia.org/wiki/Defense