Definition of rec room noun from the Oxford Advanced American Dictionary

 

rec room

 noun
noun
NAmE//ˈrɛk rum//
 
, NAmE//ˈrɛkrʊm//
 
(formal recreation room)
 
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a room in a home, school, hospital, office building, etc. in which people can relax, play games, etc.
See the Oxford Advanced Learner's Dictionary entry: rec room