Twelfth/twelfθ/ Definition 1 of 3Pro Tip 1/3Ordinal Usage Used when ordering things in a sequence, especially with dates or positions. December is the twelfth month of the year. Pro Tip 2/3Sports and Competitions Commonly used in sports or contests to indicate a competitor's ranking. After the final scores, our team stood at twelfth. Pro Tip 3/3Scale Positions Can be associated with ranking systems, like in class or on a list. He was twelfth on the bestsellers list.