XXVIII

from WordNet (r) 3.0 (2006)
xxviii
    adj 1: being eight more than twenty [syn: {twenty-eight}, {28},
           {xxviii}]
    n 1: the cardinal number that is the sum of twenty-seven and one
         [syn: {twenty-eight}, {28}, {XXVIII}]
    
from The Collaborative International Dictionary of English v.0.48
xxviii \xxviii\, adj.
   The Roman number representing {twenty-eight}.

   Syn: twenty-eight, 28.
        [WordNet 1.5]
    

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