Meaning : A policy of creating strategic alliances in order to check the expansion of a hostile power or ideology or to force it to negotiate peacefully.
Example :
Containment of communist expansion was a central principle of United States' foreign policy from 1947 to the 1975.
Meaning : (physics) a system designed to prevent the accidental release of radioactive material from a reactor.
Meaning : The act of containing. Keeping something from spreading.
Example :
The containment of the AIDS epidemic.
The containment of the rebellion.