80th

from WordNet (r) 3.0 (2006)
80th
    adj 1: the ordinal number of eighty in counting order [syn:
           {eightieth}, {80th}]
    
from The Collaborative International Dictionary of English v.0.48
80th \80th\ adj.
   1. coming next after the seventy-ninth in a series

   Syn: eightieth
        [WordNet 1.5 +PJC]
    

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