/ Dictionary / Index I impost block: Meaning and Definition of Find definitions for: im'post block" Pronunciation: [key] dosseret. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. impost impostor Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language