From The Collaborative International Dictionary of English v.0.44 [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) 2.0 [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 pecefully; "containment of communist expansion was a central principle of United States' foreign policy from 1947 to the 1975"
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
62 Moby Thesaurus words for "containment": Eisenhower Doctrine, Monroe Doctrine, Nixon Doctrine, Truman Doctrine, appeasement, balance of power, brinkmanship, cincture, circling, circumambience, circumambiency, circumcincture, circumflexion, circumjacence, circumposition, coexistence, colonialism, compromise, detente, deterrence, diplomacy, diplomatic, diplomatics, dollar diplomacy, dollar imperialism, embracement, encincture, encirclement, enclosure, encompassment, enfoldment, envelopment, environment, expansionism, foreign affairs, foreign policy, girding, girdling, good-neighbor policy, imperialism, inclusion, internationalism, involvement, isolationism, manifest destiny, militarism, nationalism, neocolonialism, neutralism, nonresistance, open door, open-door policy, peace offensive, peaceful coexistence, preparedness, shirt-sleeve diplomacy, shuttle diplomacy, spheres of influence, surrounding, the big stick, tough policy, world politics
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