The children played in the 'vacant lot' [=a piece of land that is not being used] between the two buildings.
There were no 'vacant' apartments in the building. [=there were no empty apartments available to be rented]
('Brit') I found my job through the 'situations vacant' [=('US') 'help wanted'] section of the newspaper.
(..) - What do you mean, how? Rachel! Don't you see? Rachel! Oh... Look at you lot. You're all so vacant. Is it nice not being me? It must be so relaxing. - Rachel is not a name. - Then what is it? John, on the luggage, there's a label. (..)2010 TvShow: Sherlock Title: A Study in Pink Season: 1 Episode 1