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.
(..) Mary, she's the smaller one? Yes, she is. -Everyone here? -Very successful. But? There were a few vacant lots and one holdout. -Who? -William Bandy. ...eight. Who's he? He's an old man (..)2007 There Will Be Blood