n.
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
2.(physics) a system designed to prevent the accidental release of radioactive material from a reactor
3.(military) the act of containing something or someone
Idiom of the Day
speak for (something)
to make a request for something, to ask for something
I spoke for the comfortable chair as soon as I entered the room.