XIII

from WordNet (r) 3.0 (2006)

xiii
    adj 1: being one more than twelve [syn: {thirteen}, {13},
           {xiii}]
    n 1: the cardinal number that is the sum of twelve and one [syn:
         {thirteen}, {13}, {XIII}, {baker's dozen}, {long dozen}]

from The Collaborative International Dictionary of English v.0.48

xiii \xiii\, 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]

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