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]

The Collaborative International Dictionary of English v.0.48:

Hurrah \Hur*rah"\, n.
   A cheer; a shout of joy, etc.
   [1913 Webster]

   Hurrah's nest, state of utmost confusion. [Colloq. U.S.]
      [1913 Webster]

            A perfect hurrah's nest in our kitchen. --Mrs.
                                                  Stowe.
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The Collaborative International Dictionary of English v.0.48:

Hurrah \Hur*rah"\, v. i.
   To utter hurrahs; to huzza.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hurrah \Hur*rah"\, v. t.
   To salute, or applaud, with hurrahs.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hurrah
    n 1: a victory cheer; "let's give the team a big hurrah" [syn:
         hurrah, hooray]
    v 1: shout `hurrah!'