/ Dictionary / Index D diacritical: Meaning and Definition of Find definitions for: di•a•crit•i•cal Pronunciation: (dī"u-krit'i-kul), [key] — adj. serving to distinguish; distinctive. capable of distinguishing. serving as a diacritic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diacritical (Thesaurus) diacritic diactinic Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language