containment

C1 · Advanced Countable noun Science Technical

n. a strong structure built around a nuclear reactor to stop dangerous materials from escaping.

n. a physical system or structure designed to prevent the accidental release of radioactive or hazardous materials into the environment.

“Engineers checked the steel containment building for any signs of damage.”

“The nuclear facility was equipped with a secondary containment shell designed to withstand extreme pressure in the event of a core malfunction.”

C1 · Advanced Uncountable noun Academic

n. a policy used to stop a hostile country from becoming more powerful or gaining more land.

n. a geopolitical strategy, notably during the Cold War, aimed at preventing the expansion of a hostile foreign power.

“The policy of containment was designed to stop the spread of communism.”

“Diplomatic historians often debate the long-term efficacy of the containment doctrine in shaping international relations during the mid-twentieth century.”

C2 · Proficiency Uncountable noun Mathematics Technical

n. the relationship where one set of numbers or objects is completely inside another set.

n. the relation between two sets when every element of the first is also an element of the second.

“The teacher explained the containment of the set of even numbers within the set of integers.”

“In set theory, the symbol for containment indicates that one subset is entirely comprised within a larger superset.”