A size

A size

[′ā ‚sīz] (engineering) One of a series of sizes to which trimmed paper and board are manufactured; for size A N, with N equal to any integer from 0 to 10, the length of the longer side is 2-(2 N- 1)/4meters, while the length of the shorter side is 2-(2 N + 1)/4meters, with both lengths rounded off to the nearest millimeter. Of a sheet of paper, the dimensions 8.5 inches by 11 inches (216 millimeters by 279 millimeters).