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).
References in classic literature ?
Thence we sailed to the isle of Rohat where the camphor trees grow to such a size that a hundred men could shelter under one of them with ease.
The river here assumed a size and appearance which, even at the highest point we ultimately reached, was scarcely diminished.