the action or process of keeping something contained with a set of limits or restrictions, especially of controlling something harmful;
e.g. An essential step to the containment of disease is separating infected individuals from healthy ones.
(noun)
the action, process, policy, or results of containing some hostile power or influence and preventing it from expanding, especially in the context of international relations;
e.g. They adopted an approach of containment to avoid any further attacks from the hostile nation.