The Collaborative International Dictionary of English v.0.48:

Silence \Si"lence\, interj.
   Be silent; -- used elliptically for let there be silence, or
   keep silence. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Silence \Si"lence\, v. t. [imp. & p. p. Silenced; p. pr. & vb.
   n. Silencing.]
   1. To compel to silence; to cause to be still; to still; to
      hush.
      [1913 Webster]

            Silence that dreadful bell; it frights the isle.
                                                  --Shak.
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   2. To put to rest; to quiet.
      [1913 Webster]

            This would silence all further opposition.
                                                  --Clarendon.
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            These would have silenced their scruples. --Rogers.
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   3. To restrain from the exercise of any function, privilege
      of instruction, or the like, especially from the act of
      preaching; as, to silence a minister of the gospel.
      [1913 Webster]

            The Rev. Thomas Hooker of Chelmsford, in Essex, was
            silenced for nonconformity.           --B. Trumbull.
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   4. To cause to cease firing, as by a vigorous cannonade; as,
      to silence the batteries of an enemy.
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The Collaborative International Dictionary of English v.0.48:

Silence \Si"lence\, n. [F., fr. L. silentium. See Silent.]
   [1913 Webster]
   1. The state of being silent; entire absence of sound or
      noise; absolute stillness.
      [1913 Webster]

            I saw and heared; for such a numerous host
            Fled not in silence through the frighted deep.
                                                  --Milton.
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   2. Forbearance from, or absence of, speech; taciturnity;
      muteness.
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   3. Secrecy; as, these things were transacted in silence.
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            The administration itself keeps a profound silence.
                                                  --D. Webster.
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   4. The cessation of rage, agitation, or tumilt; calmness;
      quiest; as, the elements were reduced to silence.
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   5. Absence of mention; oblivion.
      [1913 Webster]

            And what most merits fame, in silence hid. --Milton.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

218 Moby Thesaurus words for "silence":
   answer, answer conclusively, argue down, asphyxiate, ataraxia,
   ataraxy, blow to pieces, blow up, blunt, bottle up, brain, brevity,
   briefness, bring down, brusqueness, burn to death, calm, calmness,
   censor, choke, choke off, clamp down on, composure, conciseness,
   confound, confute, contemplation, contradict, controvert, cork,
   cork up, crack down on, crush, curtains, curtness, cut down,
   cut to pieces, damp, damp down, dampen, deaden, deal a deathblow,
   decease, deck, defeat, deflate, demise, demolish, deny, disarm,
   disintegrate, dismiss, dispose of, dissolution, drop, drown, dumb,
   dumbfound, dumbness, economy of words, emasculate, enchain,
   extinguish, fell, finish, floor, frag, gag, give the quietus,
   gun down, hamstring, handcuff, hobble, hog-tie, hold down,
   hugger-mugger, hugger-muggery, hush, hush-hush, imperturbability,
   incinerate, inhibit, jugulate, jump on, keep down, keep under,
   kill, knock out, laconicalness, laconism, lapidate, lay low,
   lucid stillness, lull, manacle, marmoreal repose, mitigate,
   mollify, muffle, mute, muteness, muzzle, nirvana, noiselessness,
   nonplus, obmutescence, overcome, overmaster, overmatch, overpower,
   overset, overthrow, overturn, overwhelm, pacify, paralyze, parry,
   passing, pauciloquy, peace, peacefulness, pistol, placidity,
   placidness, poleax, pour water on, propitiate, prostrate, put down,
   put out, put to silence, quash, quell, quench, quiescence,
   quiescency, quiet, quieten, quietism, quietness, quietude, quietus,
   rebut, reduce to silence, refute, repose, repress, rest,
   restfulness, restrain, reticence, riddle, satori, secretiveness,
   secretness, send flying, serenity, settle, shoot, shoot down,
   shoot to death, shortness, shotgun, shush, shut down on, shut off,
   shut up, silken repose, sit down on, sit on, sleep, slumber, smash,
   smash all opposition, smother, snuff out, soft-pedal, soothe,
   soundlessness, sparingness of words, speechlessness, squash,
   squelch, stab to death, stamp out, stanch, stifle, still,
   stillness, stone, stone to death, strangle, strike dead,
   strike dumb, stultify, subdue, subvert, suffocate, suppress,
   surmount, taciturnity, temper, terseness, throttle, trample out,
   trample underfoot, tranquillity, trip, trip up, truss up,
   uncommunicativeness, undermine, unloquaciousness, untalkativeness,
   upset, vaporize, wise passiveness, wordlessness