Definition of homeroom noun from the Oxford Advanced American Dictionary

 

homeroom

 noun
noun
NAmE//ˈhoʊmrum//
 
, NAmE//ˈhoʊmrʊm//
 
[countable, uncountable]
 
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a room in a school where students go at the beginning of each school day, so that teachers can check who is in school; the time spent in this room Homeroom lasts for ten minutes.
See the Oxford Advanced Learner's Dictionary entry: homeroom