The Collaborative International Dictionary of English v.0.48:

Hurrah \Hur*rah"\ Hurra \Hur*ra"\, interj. [Cf. G., Dan., & Sw.
   hurra. Cf. Huzza.]
   A word used as a shout of joy, triumph, applause,
   encouragement, or welcome.
   [1913 Webster]

         Hurrah! hurrah! for Ivry and Henry of Navarre.
                                                  --Macaulay.
   [1913 Webster]