A door is a moving structure that when closed acts as a barrier to a room, house, building, or car. You'll have to open the door to let your dog come inside.

Buildings have doors, and so do most vehicles. You might also have a special little door built into your own back door for your cat. Doors act as security, as they can be closed and locked, and also as ventilation when you open the door to let the spring air in. Being "out of doors" means you're outside, beyond all the doors of your house or building.

Definitions of door

n 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”
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car door
the door of a car
cargo door
door used to load or unload cargo
double door
two vertical doors that meet in the middle of the door frame when closed
fire door
a fire-resistant door that can be closed to stop the spread of a fire
French door
a light door with transparent or glazed panels extending the full length
interior door
a door that closes off rooms within a building
revolver, revolving door
a door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings
screen, screen door
a door that consists of a frame holding metallic or plastic netting; used to allow ventilation and to keep insects from entering a building through the open door
sliding door
a door that opens by sliding instead of swinging
storm door
an extra outer door for protection against severe weather or winter
swing door, swinging door
a door that swings on a double hinge; opens in either direction
trap door
a hinged or sliding door in a floor or ceiling
barn door
the large sliding door of a barn
one of a pair of swinging doors (as at the entrance to a western saloon)
bi-fold door
an interior door
accordion door, folding door
an interior door that opens by folding back in sections (rather than by swinging on hinges)
French window
a French door situated in an exterior wall of a building
hatchback, hatchback door
a sloping rear car door that is lifted to open
Type of:
movable barrier
a barrier that can be moved to allow passage

n the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close

doorway, room access, threshold
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exterior door, outside door
a doorway that allows entrance to or exit from a building
back door, back entrance, backdoor
an entrance at the rear of a building
Dutch door, half door
an exterior door divided in two horizontally; either half can be closed or open independently
front door, front entrance
exterior door (at the entrance) at the front of a building
side door, side entrance
an exterior door at one side of a building
Type of:
entrance, entranceway, entree, entry, entryway
something that provides access (to get in or get out)

n anything providing a means of access (or escape)

“we closed the door to Haitian immigrants”
“education is the door to success”
open door
freedom of access
Type of:
access, accession, admission, admittance, entree
the right to enter

n 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”
Type of:
construction, structure
a thing constructed; a complex entity constructed of many parts

n a room that is entered via a door

“his office is the third door down the hall on the left”
Type of:
an area within a building enclosed by walls and floor and ceiling

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