/ Dictionary / Index V vicinal: Meaning and Definition of Find definitions for: vic•i•nal Pronunciation: (vis'u-nl), [key] — adj. of, pertaining to, or belonging to a neighborhood or district. neighboring; adjacent. noting a plane the position of which varies very little from that of a fundamental plane of the form. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vicinal (Thesaurus) vicinage vicinity Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language