From The Collaborative International Dictionary of English v.0.48 [gcide]:
4. the act of restricting some deleterious substance within a confined space, especially when such material is released unintentionally or by accident; as, containment of nuclear waste; containment of an oil spill. Also used attributively, as a containment boom. [PJC]
From WordNet (r) 3.0 (2006) [wn]:
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 peacefully; "containment of communist expansion was a central principle of United States' foreign policy from 1947 to the 1975"
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