noun
a recreation room for noisy activities (parties or children's play etc)
• Hypernyms: ↑recreation room, ↑rec room
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noun, pl ⋯ rooms [count]
US somewhat old-fashioned : a room usually in the basement of a house that a family uses for games, parties, etc.
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a room in a house for playing games in, sometimes in the ↑basement
Useful english dictionary. 2012.