A concentration camp is a place, near the scene of intended operations or near an embarkation point, where troops are assembled for immediate use against the enemy or for transport to an over-sea theater of operations.

1930, Winston S. Churchill, My Early Life, Chapter XIV
The 21st Lancers… …journey forward by nine days' march to the advanced concentration camp just north of the Shabluka Cataract.

All Cubans (men, women, and children) were ordered to move into garrisoned Spanish towns or concentration camps.

In 1945, overseen by Alfred Hitchcock, a crack team of British film-makers went to Germany to document the horror of the concentration camps.

What we should be doing with China is understanding they are a superpower, they are a strong economy. We want to be working with them. We certainly don't want a Cold War. But we should be speaking out against human rights abuses. When you put into concentration camps, you know, or at least lock up, I don't know, a million Muslims there, somebody's got to speak out about that.

The UN inspector stated that the Australian government's migrant detention facilities were in effect concentration camps.

Concentration camp

Meaning

Noun