The Collaborative International Dictionary of English v.0.48:

Emit \E*mit"\, v. t. [imp. & p. p. Emitted; p. pr. & vb. n.
   Emitting.] [L. emittere to send out; e out + mittere to
   send. See Mission.]
   1. To send forth; to throw or give out; to cause to issue; to
      give vent to; to eject; to discharge; as, fire emits heat
      and smoke; boiling water emits steam; the sun emits light.
      [1913 Webster]

            Lest, wrathful, the far-shooting god emit
            His fatal arrows.                     --Prior.
      [1913 Webster]

   2. To issue forth, as an order or decree; to print and send
      into circulation, as notes or bills of credit.
      [1913 Webster]

            No State shall . . . emit bills of credit. --Const.
                                                  of the U. S.
      [1913 Webster]

WordNet (r) 3.0 (2006):

emit
    v 1: expel (gases or odors) [syn: emit, breathe, pass off]
    2: give off, send forth, or discharge; as of light, heat, or
       radiation, vapor, etc.; "The ozone layer blocks some harmful
       rays which the sun emits" [syn: emit, give out, give
       off] [ant: absorb, take in]
    3: express audibly; utter sounds (not necessarily words); "She
       let out a big heavy sigh"; "He uttered strange sounds that
       nobody could understand" [syn: utter, emit, let out,
       let loose]

Moby Thesaurus II by Grady Ward, 1.0:

126 Moby Thesaurus words for "emit":
   aerate, aerify, articulate, atomize, bleed, blow, breathe,
   breathe out, bring out, carbonate, chime, chlorinate, chorus,
   come out with, communicate, convey, deliver, discharge, disclose,
   disembogue, distill, drip, effuse, egest, eject, eliminate,
   emanate, enunciate, etherify, etherize, evacuate, evaporate,
   excrete, exfiltrate, exhale, exhaust, expel, expire, express,
   extravasate, extrude, exudate, exude, filter, filtrate, fling off,
   flow, fluidize, formulate, fractionate, fume, fumigate, gasify,
   get off, get out, give, give expression, give forth, give off,
   give out, give out with, give tongue, give utterance, give vent to,
   give voice, hydrogenate, impart, issue, leach, let out, lip,
   lixiviate, loose, ooze, open the floodgates, open the sluices,
   out with, oxygenate, pass, pass off, percolate, perfume, phonate,
   phrase, pour, pour forth, pour out, present, pronounce, puff,
   put forth, put in words, put out, radiate, raise, reek, release,
   say, secrete, seep, send forth, send out, set forth, smoke, sound,
   spray, steam, strain, sublimate, sublime, tell, throw off,
   transpire, transude, utter, vapor, vaporize, vent, verbalize,
   vocalize, voice, void, volatilize, weep, whisper, word