door

noun

1. a swinging or sliding barrier that will close the entrance to a room or building or vehicle"he knocked on the door"
2. 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"
3. anything providing a means of access (or escape)"we closed the door to Haitian immigrants"
4. a structure where people live or work (usually ordered along a street or road)"the office next door"
5. a room that is entered via a door"his office is the third door down the hall on the left"