Noun
1. a policy of creating strategic alliances in order to check the expansion of a hostile power or ideology or to force it to negotiate pecefully;
"containment of communist expansion was a central principle of United States' foreign policy from 1947 to the 1975"2. (physics) a system designed to prevent the accidental release of radioactive material from a reactor
3. (military) the act of containing something or someone; keeping it from spreading;
"the army was charged with the containment of the rebel forces"