If someone is attached to an organization or group of people, they are working with them, often only for a short time. Ford was attached to the battalion's first line of transport
associated in an exclusive sexual relationship used of buildings joined by common sidewalls; "a block of attached houses"
If one organization or institution is attached to a larger organization, it is part of that organization and is controlled and run by it. At one time the schools were mainly attached to the church. = affiliated