/ˈveɪkənt/
(of a seat, hotel room, house, etc. 座位、旅馆房间、房屋等) empty; not being used 空着的；未被占用的 SYN unoccupied
vacant properties
未被占用的房地产
The seat next to him was vacant.
他旁边的座位空着。
(especially NAmE)
a vacant lot (= a piece of land in a city that is not being used)
一块闲置的地皮