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Webster 1913 Edition

Noun.

That which is contained; the extent; the substance.

[Obs.]

The

containment

of a rich man’s estate.

Fuller.

containment ‎(countable and uncountable, plural containments)

(uncountable) The state of being contained.
(uncountable, countable) The state of containing.
(uncountable, countable) Something contained.
(uncountable, countable) a policy of checking the expansion of a hostile foreign power by creating alliances with other states; especially the foreign policy strategy of the United States in the early years of the Cold War.
(countable) a physical system designed to prevent the accidental release of radioactive or other dangerous materials from a nuclear reactor or industrial plant.
(countable, mathematics) an inclusion