(adj) referring to or relating to or having the style of architecture created by Andrea Palladio, Example:the much imitated arch and column compositions known as the Palladian motif
prop. a. (Arch.) Of, pertaining to, or designating, a variety of the revived classic style of architecture, founded on the works of Andrea Palladio, an Italian architect of the 16th century; as, a Palladian window. [ 1913 Webster ]