An office is a room or a part of a building where people work sitting at desks.

An office is a department of an organization, especially the government, where people deal with a particular kind of administrative work.

An office is a small building or room where people can go for information, tickets, or a service of some kind.

A doctor's or dentist's office is a place where a doctor or dentist sees their patients.

If someone holds office in a government, they have an important job or position of authority.

Someone's good offices are the help that they give to other people who are trying to achieve something.