Real Dictionary

wallpaper
variable noun: Wallpaper is thick coloured or patterned paper that is used for covering and decorating the walls of rooms.

wallpaper in American English
paper, usually with colored patterns printed on it, for covering the walls or ceiling of a room
to hang or apply wallpaper on or in
noun: paper, usually with printed decorative patterns in color, for pasting on and covering the walls or ceilings of rooms, hallways, etc
transitive verb: to put wallpaper on (a wall, ceiling, etc.) or to furnish (a room, house, etc.) with wallpaper

wallpaper in British English
noun: paper usually printed or embossed with designs for pasting onto walls and ceilings
verb: to cover (a surface) with wallpaper