/ Dictionary / Index L letterform: Meaning and Definition of Find definitions for: let•ter•form Pronunciation: (let'ur-fôrm"), [key] — n. a sheet of stationery used for letters. the shape of a letter of the alphabet with regard to its design or historical development. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lettered letterhead Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language