1. (noun)December, Dec the last (12th) month of the year Synonyms: celestial latitude, declination
2. (noun)declination, celestial latitude, dec (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere Synonyms: dec, fall, descent, declination, celestial latitude, declension, declivity, regrets, decline, downslope
Synonyms and Antonyms of dec 
