internment - definition and synonyms

noun 

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/ɪnˈtɜː(r)nmənt/
singularinternment
pluralinternments
  1. 1
    [uncountable] the act of putting someone in a prison without officially accusing them of a crime, especially when this is done for political reasons
  2. 2
    [countable/uncountable] the period of time that someone spends interned in a prison