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containment

The definition of containment is keeping something restricted or under control, or to describe preventing a hostile country or hostile influence from expanding its influence.

(noun)

Efforts to stop a disease from spreading to new populations are an example of containment.
Trying to keep a harmful dictator from expanding his reach is an example of containment.

See containment in Webster's New World College Dictionary

noun

a containing or being contained; esp.,

the policy of attempting to prevent the influence of an opposing nation or political system from spreading
the U.S. post-WWII policy of checking the political and territorial expansion of the U.S.S.R.
the systems used to confine highly radioactive experiments, fusion experiments, etc., esp. the steel and concrete shell used in a nuclear power plant
in full containment structure

See containment in American Heritage Dictionary 4

noun

The act or condition of containing.
A policy of checking the expansion or influence of a hostile power or ideology, as by the creation of strategic alliances or support of client states in areas of conflict or unrest.
A structure or system designed to prevent the accidental release of radioactive materials from a reactor.

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