4th

from WordNet (r) 3.0 (2006)

4th
    adj 1: coming next after the third and just before the fifth in
           position or time or degree or magnitude; "the quaternary
           period of geologic time extends from the end of the
           tertiary period to the present" [syn: {fourth}, {4th},
           {quaternary}]

from The Collaborative International Dictionary of English v.0.48

4th \4th\ adj.
   1. coming next after the third in position

   Syn: fourth, quaternary
        [WordNet 1.5 +PJC]