noun A portal of entry into a building, room, or vehicle, typically consisting of a rigid plane movable on a hinge. It may have a handle to help open and close, a latch to hold it closed, and a lock that ensures it cannot be opened without a key.
bathroom door, bedroom door, doorkey, exterior door, interior door
noun A building with a door, especially a house.
His house is three doors down.
noun Any flap, etc., that opens like a door.
cupboard door
noun An entry point.
noun A means of approach or access.
Learning is the door to wisdom.
noun A possibility.
to leave the door open
noun A barrier.
Keep a door on your anger.
noun A software mechanism by which a user can interact with a program running remotely on a bulletin board system. See BBS door.