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