From Longman Dictionary of Contemporary Englishsolitary confinementˌsolitary conˈfinement noun [uncountable] SCJa punishment in which a prisoner is kept alone and is not allowed to see anyone elsein solitary confinement He spent more than half his time in prison in solitary confinement.
Examples from the Corpus
solitary confinement• There is plenty of evidence, too, that orangs kept in cramped solitary confinement become not only bored but mentally sick.• Mordechai Vanunu continues to be held in solitary confinement in Ashkelon prison.• Xi is in solitary confinement, allowed only monthly visits with his father.• I spent the vast majority of my time in solitary confinement.• My days of solitary confinement were over.• Fry opposed the penal reformers' prevailing orthodoxy of solitary confinement.• I read once that nobody can stand more than ten years in prison, or more than one year of solitary confinement. 