Source : Webster's Revised Unabridged Dictionary (1913)

Hurrah \Hur*rah"\, n.
   A cheer; a shout of joy, etc.

   {Hurrah's nest}, state of utmost confusion. [Colloq. U.S.]

            A perfect hurrah's nest in our kitchen. --Mrs.
                                                  Stowe.

Hurrah \Hur*rah"\, v. t.
   To salute, or applaud, with hurrahs.

Hurrah \Hur*rah"\, v. i.
   To utter hurrahs; to huzza.

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.

         Hurrah! hurrah! for Ivry and Henry of Navarre.
                                                  --Macaulay.

Source : WordNet®

hurrah
     n : a victory cheer; "let's give the team a big hurrah" [syn: {hooray}]
     v : shout `hurrah!'