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"
a room that is entered via a door; "his office is the third door down the hall on the left"
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"
anything providing a means of access (or escape); "we closed the door to Haitian immigrants"; "education is the door to success"
the position of the football player in the backfield who directs the offensive play of his team; "quarterback is the most important position on the team"
used of a height or viewpoint; "a commanding view of the ocean"; "looked up at the castle dominating the countryside"; "the balcony overlooking the ballroom"