1. noun
a) A regularly-shaped slab of clay or other material, affixed to cover or decorate a surface, as in a roof-tile, glazed tile, stove tile, etc.
Each tile within Google Maps consists of 256 × 256 pixels.
b) A rectangular graphic.
Sprites and tiles that are hidden in the prototype ROM file can be recovered.
See Also: tiler
2. verb
a) To cover with tiles.
b) To arrange in a regular pattern, with adjoining edges (applied to tile-like objects, graphics, windows in a computer interface).
See Also: tiler
Wikipedia foundation.