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Meaning: imprisonment without charge or a trial
Hundreds of asylum seekers and refugees have been held in administrative detention for years.
We're holding troublemakers who criticized our government in administrative detention.
Note: For advanced students: Many countries use "administrative detention" to imprison people for long periods without trial. It's used to imprison asylum seekers and refugees, terrorism suspects, and people who are seen as a threat to the government. It's often criticised for being an abuse of civil, political and human rights. The Universal Declaration of Human Rights provides protection against the abuse of power by governments, and the use of "administrative detention" has often been seen as an example of this sort of abuse.
"Administrative detention" is a euphemism for imprisonment