Paper for writing letters on; especially, a size of paper intermediate between note paper and foolscap. See Paper.(noun)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "letter paper" in a sentence
"The bearer is now ready to start & I must close I spoke to cousin Mary about letter paper pencils & small long narrow books. you try & send them to me Mr James will bring them for me"