solitary confinement

noun
the confinement of a prisoner in a cell or other place in which he or she is completely isolated from others.

Origin:
1775–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
solitary confinement
 
n
isolation imposed on a prisoner, as by confinement in a special cell

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
They had been committed to the prison after his siege of solitary confinement
  had begun.
In prisons, solitary confinement is used as punishment.
Not really same as one can learn little about free humans from studying humans
  in the solitary confinement wing of a prison.
The pernicious use of solitary confinement for a nonviolent, low-risk prisoner.
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