18th

from WordNet (r) 3.0 (2006)
18th
    adj 1: coming next after the seventeenth in position [syn:
           {eighteenth}, {18th}]
    
from The Collaborative International Dictionary of English v.0.48
18th \18th\ adj.
   1. coming next after the seventeenth in a series

   Syn: eighteenth
        [WordNet 1.5 +PJC]
    

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