/ Dictionary / Index B block capital: Meaning and Definition of Find definitions for: block' cap"ital Pronunciation: [key] a sans-serif letter with lines of uniform weight. Cf. block letter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. blockbusting block caving Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language