Meaning of letter-quality

let•ter-qual•i•ty

Pronunciation: (let'ur-kwol"i-tē), [key]
— adj.
  1. (of computer printers and their output) pertaining to an appearance equal in legibility and resolution to copy typed on an electric typewriter: A letter-quality printer produces sharper copy than a dot-matrix model.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.