/ Dictionary / Index B block letter: Meaning and Definition of Find definitions for: block' let"ter Pronunciation: [key] a sans-serif typeface or letter, usually compressed and having tight curves. &blokltrstart; This is a sample of block letter&blokltrend; a simple, hand-printed capital letter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. block lava block line Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language