The Collaborative International Dictionary of English v.0.48:

Riot \Ri"ot\, v. t.
   To spend or pass in riot.
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         [He] had rioted his life out.            --Tennyson.
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The Collaborative International Dictionary of English v.0.48:

Riot \Ri"ot\, n. [OF. riote, of uncertain origin; cf. OD. revot,
   ravot.]
   1. Wanton or unrestrained behavior; uproar; tumult.
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            His headstrong riot hath no curb.     --Shak.
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   2. Excessive and exxpensive feasting; wild and loose
      festivity; revelry.
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            Venus loveth riot and dispense.       --Chaucer.
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            The lamb thy riot dooms to bleed to-day. --Pope.
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   3. (Law) The tumultuous disturbance of the public peace by an
      unlawful assembly of three or more persons in the
      execution of some private object.
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   To run riot, to act wantonly or without restraint.
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The Collaborative International Dictionary of English v.0.48:

Riot \Ri"ot\, v. i. [imp. & p. p. Rioted; p. pr. & vb. n.
   Rioting.] [OF. rioter; cf. OD. ravotten.]
   1. To engage in riot; to act in an unrestrained or wanton
      manner; to indulge in excess of luxury, feasting, or the
      like; to revel; to run riot; to go to excess.
      [1913 Webster]

            Now he exact of all, wastes in delight,
            Riots in pleasure, and neglects the law. --Daniel.
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            No pulse that riots, and no blood that glows.
                                                  --Pope.
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   2. (Law) To disturb the peace; to raise an uproar or
      sedition. See Riot, n., 3. --Johnson.
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WordNet (r) 3.0 (2006):

riot
    n 1: a public act of violence by an unruly mob [syn: riot,
         public violence]
    2: a state of disorder involving group violence [syn: rioting,
       riot]
    3: a joke that seems extremely funny [syn: belly laugh,
       sidesplitter, howler, thigh-slapper, scream, wow,
       riot]
    4: a wild gathering involving excessive drinking and promiscuity
       [syn: orgy, debauch, debauchery, saturnalia, riot,
       bacchanal, bacchanalia, drunken revelry]
    v 1: take part in a riot; disturb the public peace by engaging
         in a riot; "Students were rioting everywhere in 1968"
    2: engage in boisterous, drunken merrymaking; "They were out
       carousing last night" [syn: carouse, roister, riot]

The Devil's Dictionary (1881-1906):

RIOT, n.  A popular entertainment given to the military by innocent
bystanders.