a space or place that is available to be used

We wanted to book a hotel room in July but there were no vacancies. 我们想预订7月份的宾馆房间，但是已经没有空房了。

The dentist can't see you today but she has a vacancy tomorrow morning. 牙医今天不能给你看病，不过她明天上午有空。

There are still some vacancies for students in science and engineering, but the vacancies in humanities have been filled. 理工科课程还有听课名额，而人文学科课程已经招满了。

a job that no one is doing and is therefore available for someone new to do

There is a vacancy for a shop assistant on Saturdays. 商店有个星期六上班的店员职位空缺。