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]