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.
      [1913 Webster]

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!'

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "hurrah":
   alleluia, applaud, applause, ardor, bark, battle cry, bawl, bellow,
   calenture, call, caterwaul, cheer, chorus of cheers, coil,
   contention, controversy, cry, cry for joy, dispute, enthusiasm,
   fervor, fire, furore, fuss, give a cheer, hallelujah, halloo, hear,
   holler, hollo, hooray, hoot, hosanna, howl, hurray, huzzah, paean,
   rah, rallying cry, roar, ruckus, rumpus, scream, screech, shindy,
   shout, shout hosanna, shriek, squall, squeal, to-do, uproar,
   war cry, war whoop, whoop, yammer, yap, yawl, yawp, yell, yelp,
   yippee, yo-ho, yowl, zeal