The Collaborative International Dictionary of English v.0.48:

Vent \Vent\, v. t. [imp. & p. p. Vented; p. pr. & vb. n.
   Venting.]
   1. To let out at a vent, or small aperture; to give passage
      or outlet to.
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   2. To suffer to escape from confinement; to let out; to
      utter; to pour forth; as, to vent passion or complaint.
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            The queen of heaven did thus her fury vent.
                                                  --Dryden.
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   3. To utter; to report; to publish. [Obs.]
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            By mixing somewhat true to vent more lies. --Milton.
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            Thou hast framed and vented very curious orations.
                                                  --Barrow.
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   4. To scent, as a hound. [Obs.] --Turbervile.
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   5. To furnish with a vent; to make a vent in; as, to vent. a
      mold.
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WordNet (r) 3.0 (2006):

venting
    n 1: the act of venting [syn: discharge, venting]