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.
(..) Precisely. I know that your powers of retention Are as wet as a warthog's backside But thick as you are, pay attention My words are a matter of pride It's clear from your vacant expressions The lights are not all on upstairs But we're talking kings and successions Even you can't be caught unawares (..)1994 The Lion King