The Collaborative International Dictionary of English v.0.48:

Uproar \Up"roar\ ([u^]p"r[=o]r`), n. [D. oproer; akin to G.
   aufruhr, Dan. opr["o]r, Sw. uppror; D. op up + roeren to
   stir; akin to AS. hr[=e]ran to stir, hr[=o]r stirring,
   active, G. r["u]hren to stir, OHG. ruoren, Icel. hr[ae]ra,
   Dan. r["o]re, Sw. r["o]ra. Cf. Rearmouse.]

   Note: [In verse, sometimes accented on the second syllable.]
   Great tumult; violent disturbance and noise; noisy confusion;
   bustle and clamor.
   [1913 Webster]

         But the Jews which believed not, . . . set all the city
         on an uproar.                            --Acts xvii.
                                                  5.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Uproar \Up*roar"\, v. t.
   To throw into uproar or confusion. [Obs.] "Uproar the
   universal peace." --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Uproar \Up*roar"\, v. i.
   To make an uproar. [R.] --Carlyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

uproar
    n 1: a state of commotion and noise and confusion [syn:
         tumult, tumultuousness, uproar, garboil]
    2: loud confused noise from many sources [syn: hubbub,
       uproar, brouhaha, katzenjammer]