/ Dictionary / Index D December: Meaning and Definition of Find definitions for: De•cem•ber Pronunciation: (di-sem'bur), [key] — n. the twelfth month of the year, containing 31 days. Abbr.: Dec. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: december (Thesaurus) decem* Decembrist Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language