Real Dictionary

tile
variable noun: Tiles are flat, square pieces of baked clay, carpet, cork, or other substance, which are fixed as a covering onto a floor or wall.

tile in American English
a thin, usually rectangular piece of stone, concrete, or unglazed, fired clay, used for roofing, flooring, etc.
to cover with tiles
noun: a thin slab or bent piece of baked clay, sometimes painted or glazed, used for various purposes, as to form one of the units of a roof covering, floor, or revetment
transitive verb: to cover with or as with tiles

tile in British English
noun: a flat thin slab of fired clay, rubber, linoleum, etc, usually square or rectangular and sometimes ornamental, used with others to cover a roof, floor, wall, etc