What the Hell Does Containment Mean?

For the past few weeks, I keep hearing about containing ISIS. Containing ISIS is our strategy. What the heck does that mean? Can we get some definitive answers as to what that means? And if I sound repetitive, I am, because I have no idea what containment means when the Obama Administration says it.

1.the act or condition of containing.
2. an act or policy of restricting the territorial growth or ideological influence of another, especially 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.

Let's take the second definition. "The policy of restricting the territorial growth..." The way I see it, the White House policy is NOT to defeat ISIS. It is to let them have the caliphate where they are. This is similar to his "red lines" in Syria. He wants to let countries do whatever they are going to do, no matter how evil and detrimental it is to the world. He views IS as a state. Therefore they are afforded the right to be left alone. Why so many folks go along or agree with this monstrously stupid policy is beyond me.

The sad part is that the President actually believes this. He believes in this policy. While I disagree with many positions Barack Obama has taken, this one is not just disagreeable. The containment doctrine will go down in history as one of the stupidest and immoral the U.S. has ever taken.