One who shares an office with another

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

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

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.

(medicine) The use of medical diagnostic devices in the office of a treating physician, not relying on an outside service.

Individual required to maintain accounting, including records thereof, of property and funds, whether public or quasi-public. The accountable officer may or may not have physical possession of the property or funds.

(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.

A voluntary, unpaid officer of an organization.