DEC, dec or Dec may refer to: Abbreviations, initialisms, acronyms. December, the 12th month and final month of the year in the Julian and Gregorian calendars. Decade (log scale), a unit for measuring ratios on a logarithmic scale. Declination, a term from astronomy. Diethylcarbamazine, an anti-parasite drug. Diethyl carbonate, an organic solvent. Diplome d’Études Collegiales, French name for Diploma of College Studies, a college studies diploma issued in Quebec. Oratorical Declamation, an event in competitive debate.
https://en.wikipedia.org/wiki/Dec