containment

noun6

1. •
   The state of being contained.

   • A new siding and turnback facility at Midleton will also be developed, along with new cable containment routes. — 2024
2. •
   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.

   • Mr. Putin has reinvigorated an alliance that spent years confused about its purpose once it lost the adversary it was formed to contain, the Soviet Union. Now, containment is back. — 2022
3. •
   A physical system designed to prevent the accidental release of radioactive or other dangerous materials from a nuclear reactor or industrial plant.
4. •
   The state of containing.
5. •
   An inclusion.
6. •
   (no longer used) Something contained.

   • The containment of a rich man's estate. — 1655