1. An unoccupied space or empty place; such as, unoccupied lodgings or offices: "The vacancy between the walls was filled with trash."

"This apartment building still has no vacancies."

"There is a vacancy on the second floor at the rear of the building."

"The personnel department is trying to fill a vacancy in the shipping department."

2. A gap; an opening; a breach.
3. An office, position, or tenancy that is unfilled or unoccupied: "There is no vacancy on the Supreme Court."
4. A lack of thought or intelligence: "Shirley had a look of utter vacancy when she was asked what happened yesterday."