letter-size UK US adjective [before noun] (US
► COMMUNICATIONS, WORKPLACE, MEASURES used to describe paper that measures 8½ inches by 11 inches (= 21.59 cm by 27.94 cm), the standard size of office paper in the US: »
I reformatted my document to print it on letter-size paper.
»The calendars will be printed on US letter paper.
Financial and business terms. 2012.