adj. The Roman number symbolizing the value twelve; denoting a quantity consisting of 12 items or units. Used after a noun it may symbolize the ordinal number; as, Superbowl XII. Syn. -- twelve, 12, dozen. [ WordNet 1.5 ]
adj. 1. the Roman number symbolizing the value thirteen. Used after a noun it may symbolize the ordinal number; as, Superbowl XIII. Syn. -- thirteen, 13. [ WordNet 1.5 ]