
1) Barrier formed by politicians 2) Common barrier 3) Shared barrier
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https://www.crosswordclues.com/clue/party-wall

n. a wall shared by two adjoining premises which is on the property line, such as in townhouses, condominiums, row houses or two units in a duplex. Both owners are responsible for maintaining structural integrity of the wall, even if the wall is entirely on the property of one of the parties.
Found on
http://dictionary.law.com/Default.xhtml?selected=1464

A party wall (occasionally parti-wall or parting wall) is a dividing partition between two adjoining buildings (or units) that is shared by the tenants of each residence or business. When built for this purpose, the builder will lay the wall along a property line dividing two terraced flats or row houses, so that one half of the wall`s thickness ....
Found on
http://en.wikipedia.org/wiki/Party_wall

A wall (or fence), the ownership of which is divided vertically between neighbouring properties so each property owns one distinct half of the wall (or fence)
Found on
http://www.elc.org.uk/pages/lawlegalglossary.htm

A wall shared between two properties, such as is the case with semi-detached houses.
Found on
http://www.encyclo.co.uk/local/20704

A wall between two adjoining living quarters in a multi-family dwelling
Found on
http://www.encyclo.co.uk/local/21113

It is referred to the wall created on the boundary of the two properties and which serves as a common structure between the two premises owned by different parties.The wall may be partly on each property or fully on ones property but is still a common structure. It is the duty of party of each property to maintain the wall.
Found on
http://www.encyclo.co.uk/local/21213

A wall used for joint service by adjoining buildings.
Found on
http://www.encyclo.co.uk/local/22187

A wall that is shared by two adjoining premises, either residential or business, and that is on the property line.
Found on
http://www.nolo.com/dictionary/party-wall-term.html

In architecture a party wall is a wall built upon the dividing line between two adjoining properties, usually having half its thickness on each property.
Found on
http://www.probertencyclopaedia.com/browse/TP.HTM

The wall shared by two connected properties.
Found on
http://www.spareroom.co.uk/content/info-advice/glossary-of-terms/

[
n] - a wall erected on the line between two properties and shared by both owners
Found on
http://www.webdictionary.co.uk/definition.php?query=party%20wall

A wall shared between two properties, such as is the case with semi-detached houses.
Found on
https://www.encyclo.co.uk/local/20697

a wall that divides two separate premises, which is the joint responsibility of both owners.
Found on
https://www.encyclo.co.uk/local/20914
noun a wall erected on the line between two properties and shared by both owners
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.