/ Dictionary / Index A apostil: Meaning and Definition of Find definitions for: a•pos•til Pronunciation: (u-pos'til), [key] — n. a marginal annotation or note. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. a posteriori apostilb Related Content Daily Word Quiz: quandary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language