/ Dictionary / Index D diocesan: Meaning and Definition of Find definitions for: di•oc•e•san Pronunciation: (dī-os'u-sun), [key] — adj. of or pertaining to a diocese. —n. one of the clergy or people of a diocese. the bishop in charge of a diocese. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diocesan (Thesaurus) dioc. diocese Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language