The Collaborative International Dictionary of English v.0.48:

Shout \Shout\, v. t.
   1. To utter with a shout; to cry; -- sometimes with out; as,
      to shout, or to shout out, a man's name.
      [1913 Webster]

   2. To treat with shouts or clamor. --Bp. Hall.
      [1913 Webster]

   3. To treat (one) to something; also, to give (something) by
      way of treating. [Slang, Australia & U. S.]
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Shout \Shout\, n.
   1. A loud burst of voice or voices; a vehement and sudden
      outcry, especially of a multitudes expressing joy,
      triumph, exultation, or animated courage.
      [1913 Webster]

            The Rhodians, seeing the enemy turn their backs,
            gave a great shout in derision.       --Knolles.
      [1913 Webster]

   2. A gratuitous entertainment, with refreshments or the like;
      a treat. [Slang, Australia & U. S.]
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Shout \Shout\ (shout), v. i. [imp. & p. p. Shouted; p. pr. &
   vb. n. Shouting.] [OE. shouten, of unknown origin; perhaps
   akin to shoot; cf. Icel. sk[=u]ta, sk[=u]ti, a taunt.]
   1. To utter a sudden and loud outcry, as in joy, triumph, or
      exultation, or to attract attention, to animate soldiers,
      etc.
      [1913 Webster]

            Shouting of the men and women eke.    --Chaucer.
      [1913 Webster]

            They shouted thrice: what was the last cry for?
                                                  --Shak.
      [1913 Webster]

   2. To entertain with refreshments or the like gratuitously;
      to treat. [Slang, Australia & U. S.]
      [Webster 1913 Suppl.]

   To shout at, to utter shouts at; to deride or revile with
      shouts.
      [1913 Webster]

WordNet (r) 3.0 (2006):

shout
    n 1: a loud utterance; often in protest or opposition; "the
         speaker was interrupted by loud cries from the rear of the
         audience" [syn: cry, outcry, call, yell, shout,
         vociferation]
    v 1: utter in a loud voice; talk in a loud voice (usually
         denoting characteristic manner of speaking); "My
         grandmother is hard of hearing--you'll have to shout" [ant:
         whisper]
    2: utter a sudden loud cry; "she cried with pain when the doctor
       inserted the needle"; "I yelled to her from the window but
       she couldn't hear me" [syn: shout, shout out, cry,
       call, yell, scream, holler, hollo, squall]
    3: utter aloud; often with surprise, horror, or joy; "`I won!'
       he exclaimed"; "`Help!' she cried"; "`I'm here,' the mother
       shouted when she saw her child looking lost" [syn: exclaim,
       cry, cry out, outcry, call out, shout]
    4: use foul or abusive language towards; "The actress abused the
       policeman who gave her a parking ticket"; "The angry mother
       shouted at the teacher" [syn: abuse, clapperclaw,
       blackguard, shout]

Moby Thesaurus II by Grady Ward, 1.0:

142 Moby Thesaurus words for "shout":
   Homeric laughter, alleluia, aller sans dire, applaud, applause,
   bark, battle cry, bawl, be in stitches, be manifest, be no secret,
   bellow, belly laugh, blare, blare forth, blaze, blaze abroad,
   blazon, blazon about, blow, boff, boffola, bray, break up,
   burst into laughter, burst of laughter, burst out,
   burst out laughing, burst with laughter, bust a gut, cachinnate,
   cachinnation, cackle, call, call out, caterwaul, celebrate, cheer,
   chortle, chorus of cheers, chuckle, clamor, come across,
   convulsion, crow, cry, cry for joy, cry out, declaim, exclaim,
   fit of laughter, gales of laughter, giggle, give a cheer, glare,
   go into convulsions, go without saying, guffaw, ha-ha, hail,
   hallelujah, halloo, hang out, hearty laugh, hee-haw, hee-hee,
   herald, herald abroad, hilarity, ho-ho, holler, hollo, hooray,
   hoot, horselaugh, hosanna, howl, hurrah, hurray, huzzah, laugh,
   laugh it up, laugh outright, laughing, laughter,
   nearly die laughing, need no explanation, outburst of laughter,
   paean, peal of laughter, proclaim, project, promulgate, rah,
   rallying cry, risibility, roar, roar of laughter,
   roar with laughter, sauter aux yeux, scream, screech, set up,
   shake like jelly, shake with laughter, shout hosanna,
   shout of laughter, shriek, snicker, snigger, snort,
   speak for itself, split, split with laughter, squall, squawk,
   squeal, stand, stand out, stick out, strike the eye, tee-hee,
   thunder, thunder forth, titter, trumpet, trumpet forth, vociferate,
   war cry, war whoop, whoop, yammer, yap, yawl, yawp, yell, yelp,
   yippee, yo-ho, yowl, yuck, yuk-yuk