The Collaborative International Dictionary of English v.0.48:

22 \22\ adj.
   1. one more than twenty-one; denoting a quantity consisting
      of twenty-two items or units; -- representing the number
      twenty-two as Arabic numerals

   Syn: twenty-two, xxii
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

22
    adj 1: being two more than twenty [syn: twenty-two, 22,
           xxii]
    n 1: the cardinal number that is the sum of twenty-one and one
         [syn: twenty-two, 22, XXII]