/keuhn tayn"meuhnt/ , n.
1. the act or condition of containing.
2. an act or policy of restricting the territorial growth or ideological influence of another, esp. a hostile nation.
3. (in a nuclear power plant) an enclosure completely surrounding a nuclear reactor, designed to prevent the release of radioactive material in the event of an accident.
[ 1645-55; CONTAIN + -MENT ]