21
         adj 1: being one more than twenty [syn: {twenty-one}, {21},
                  {xxi}]
         n 1: the cardinal number that is the sum of twenty and one [syn:
               {twenty-one}, {21}, {XXI}]

English Dictionary: 21	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
21st adj coming next after the twentieth in position [syn: twenty-first, 21st]