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Use "detainment" in a sentence
"Joking aside, the issue of torture and detainment is a serious one."
"He told the Senate committee that some terrorism detainees were too “dangerous” to prosecute and may have to be “held in detainment for a long time.”"
"Maybe if we just round up all people with political beliefs contrary to Obama's, put them in detainment camps, then we wouldn't need airport screenings."