open house

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o·pen house • n. a place or situation in which all visitors are welcome: they kept open house, entertaining a wide variety of artists and writers. ∎  a day when members of the public are invited to visit a place or institution, esp. one to which they do not normally have access: the president spent all morning greeting thousands of visitors to a White House open house. ∎  an informal reception or party during which one's home is open to visitors: on New Year's Day they had an open house. ∎  a time when real estate offered for sale is open to prospective buyers.