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A wall built on the boundary line of adjoining properties and shared by both owners.
[Obsolete party, shared, divided, from Old French parti; see parti-colored.]
(Law) property law a wall separating two properties or pieces of land and over which each of the adjoining owners has certain rights
a wall dividing contiguous structures.
party wall- A wall common to two adjoining buildings or rooms.
See also related terms for rooms.