Synonyms for DEC (same or very similar meaning)
WordNet sense 1 (the last (12th) month of the year):
DecemberWordNet sense 2 ((astronomy) the angular distance of a celestial body north or south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere):
declination, celestial latitudeFrom the ODE community, based on WordNetadd/edit