(countable) A place (building, office, shop, or counter) concerned with the business of delivering letters, post or mail and selling stamps, etc. / (countable) An organisation that delivers letters.

(military) An officer who fulfills a non-combat support function, often in a headquarters or planning office.

An office or booth where tickets may be purchased to allow admittance or for travel.

(countable, film, theater) A place where tickets are sold in a theatre/theater or cinema.

An official responsible for investigating people who may be truant and compelling their attendance.

A voluntary, unpaid officer of an organization.

(Britain, UK politics) The British government department, headed by the Home Secretary, responsible for internal affairs in England and Wales.

The headquarters of an organization. / A room, in a person's home, equipped as an office so that the person may work from home.

(military) An officer who derives authority directly from a sovereign power and, as such, holds a commission charging them with the duties and responsibilities of a specific office or position.

The official office of the President of the United States, located in the West Wing of the White House.