Detention

A detention can be:

 Detention (2003 movie)
 Detention (school), a punishment used in schools
Detention (Cold Case Episode), Episode 58 (Series 3 Episode 12) of CBS TV Drama Cold Case.
 Detention (band), a band from New Jersey
 Detention basin, an artificial flow control structure that is used to contain flood water for a limited period of a time
 Detention (TV series)
 Detention (imprisonment), imprisonment of somebody guilty or suspected of a crime 
 Immigration detention, imprisonment of unauthorised person entering a country