"Tile size" refers to the dimensions or measurements of a single tile, which is typically used as a building material for floors or walls. It describes how big or small each individual tile is in terms of width and length. Full definition
I want large Live tile sizes on existing phones, which will allow me to customize my Start screen just like the Start menu on my desktop. (windowscentral.com)
You'll find literally thousands of tile sizes and designs to select from. (belmontflooringcenter.com)
The Start screen gets new large tile sizes so you can see more information at once. (techradar.com)