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(1)   A swinging or sliding barrier that will close the entrance to a room or building or vehicle
"He knocked on the door"
"He slammed the door as he left"
(2)   A room that is entered via a door
"His office is the third door down the hall on the left"
(3)   A structure where people live or work (usually ordered along a street or road)
"The office next door"
"They live two doors up the street from us"
(4)   The entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close
"He stuck his head in the doorway"
(5)   Anything providing a means of access (or escape)
"We closed the door to Haitian immigrants"
"Education is the door to success"



From < , < < . Cognates include Danish , German ("door"), ("gate"), Icelandic , Latin , Modern Greek , Persian , Russian , Hindustani / , Armenain and Irish .


  1. A portal of entry into a building or room, consisting of a rigid plane movable on a hinge. Doors are frequently made of wood or metal. May have a handle to help open and close, a latch to hold the door closed and a lock that ensures the door cannot be opened without the key.
    I knocked on the vice president's door
  2. An non-physical entry into the next world, a particular feeling, a company, etc.
    Keep a door on your anger.
  3. A software mechanism by which a user can interact with a program running remotely on a bulletin board system.


  1. To cause a collision by opening the door of a vehicle in the front of an oncoming cyclist or pedestrian.