/ Dictionary / Index S subdiaconal: Meaning and Definition of Find definitions for: sub•di•ac•o•nal Pronunciation: (sub"dī-ak'u-nl), [key] — adj. of or pertaining to a subdeacon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subderivative subdiaconate Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language