Definition of open house noun from the Oxford Advanced American Dictionary

     

    open house

     noun
    noun
     
     
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  1. 1[uncountable, singular] a place or a time at which visitors are welcome It's always open house at their place. We're having a New Year's Day open house from 2 to 6.
  2. 2[countable] a day when people can visit a school, an organization, etc. and see the work that is done there
  3. 3[countable] a time when people who are interested in buying a particular house or apartment can look around it
See the Oxford Advanced Learner's Dictionary entry: open house