From Longman Dictionary of Contemporary Englishparty wallˌparty ˈwall noun [countable] TBBDHa dividing wall between two houses, apartments etc
Examples from the Corpus
party wall• The office was to be separated by a party wall from other government departments.• We've had to underpin the adjoining party wall.• In this respect, it is quite capable of spreading from one building to another through a thick party wall.From Longman Business Dictionaryparty wallˌparty ˈwall noun [countable]PROPERTYLAW a dividing wall between two houses, apartments etc, which belongs to both owners 