/ Dictionary / Index D decennary: Meaning and Definition of Find definitions for: de•cen•na•ry Pronunciation: (di-sen'u-rē), [key] — n., pl. adj. -ries, —n. a decennium. —adj. pertaining to a period of ten years; decennial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decennary (Thesaurus) decency decennial Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language