A house habitually kept open to callers.
An event, often in one's home, at which there are few restrictions regarding who and how many may attend.
An event during which a facility or institution is open to the public for inspection or tour.
(Canada and Australia) A period of time, usually several hours in a day, during which a house which is for sale is open for inspection or tour by interested parties.
We′re holding an open house this weekend at 77 Parkway Road.
A casual school event where the school invites parents or guardians to tour their child's school and meet the teachers.