/ ˈdɔːmətri; NAmE ˈdɔːrmətɔːri/ noun ( pl. -ies ) (also informal dorm )
1.
a room for several people to sleep in, especially in a school or other institution
2.
( NAmE ) = hall of residence
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WORD ORIGIN
late Middle English : from Latin dormitorium , neuter (used as a noun) of dormitorius , from dormire to sleep.