Detention is a word for confinement or imprisonment, usually for a short time. It's also a punishment where children must stay after school.

If you're in detention, you probably did something wrong: you're being confined against your will. The police hold people in detention, and so do military forces. Usually, detention is a short period of confinement, like if someone is arrested and then released. Also, the word is commonly used for an after-school punishment for children who have to stay in detention instead of going home. One thing is true of both kinds of detention: no one wants to be there.

Definitions of detention
  1. noun
    a state of being confined (usually for a short time)
    “his detention was politically motivated”
    synonyms: custody, detainment, hold
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    type of:
    the state of being confined
  2. noun
    a punishment in which a student must stay at school after others have gone home
    “the detention of tardy pupils”
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    type of:
    penalisation, penalization, penalty, punishment
    the act of punishing
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