the twelfth and last month of the year, consisting of 31 days
WordReference Random House Learner's Dictionary of American English © 2025
De•cem•ber /dɪˈsɛmbɚ/USA pronunciation
n.
WordReference Random House Unabridged Dictionary of American English © 2025- the 12th month of the year, containing 31 days. [proper noun]:See you in December.[countable]It was two Decembers ago when she visited us.Abbr.: Dec.
De•cem•ber
(di sem′bər),USA pronunciation n.
- the twelfth month of the year, containing 31 days. Abbr.: Dec.
- mens- month + -ri- suffix (with -sr-
-br- and assimilation of nasal) - *dec(em)-membri-, equivalent. to decem ten + *-membri-
- Latin december (stem decembr-) the tenth month of the early Roman year, apparently
- Old French
- Middle English decembre bef. 1000
Collins Concise English Dictionary © HarperCollins Publishers::
'December' also found in these entries (note: many are not synonyms or translations):
Aceh
- Andaman and Nicobar Islands
- Banda Aceh
- Bellow
- Boston Tea Party
- Capricorn
- Cawley
- Christmas
- Christmas Day
- Commonwealth of Independent States
- D, d
- Day of Infamy
- Dec
- Decembrist
- El Niño
- Forefathers' Day
- Frimaire
- Galle
- Geminids
- Haggai
- Holy Innocents' Day
- India
- Indian Ocean
- Indonesia
- John Birch Society
- Lesser Dionysia
- Maldives
- Memphis
- New Year's Eve
- Nivôse
- November
- October
- Pearl Harbor
- Phuket
- Portuguese India
- Pride's Purge
- Rizal Day
- Sagittarius
- Saturnalia
- Seabee
- September
- Sumatra
- Thailand
- Twentieth Amendment
- Union of Soviet Socialist Republics
- Ursids
- Vladivostok agreement
- autumn
- bulge
- cousin