The Collaborative International Dictionary of English v.0.48:

Vent \Vent\ (v[e^]nt), n. [F. vente, fr. L. vendere, -itum, to
   sell; perh. confused with E. vent an opening. See Vend.]
   Sale; opportunity to sell; market. [Obs.] --Shelton.
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         There is no vent for any commodity but of wool. --Sir
                                                  W. Temple.
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The Collaborative International Dictionary of English v.0.48:

Vent \Vent\, v. t.
   To sell; to vend. [Obs.]
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         Therefore did those nations vent such spice. --Sir W.
                                                  Raleigh.
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The Collaborative International Dictionary of English v.0.48:

Vent \Vent\, n. [Sp. venta a poor inn, sale, market. See Vent
   sale.]
   A baiting place; an inn. [Obs.]
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The Collaborative International Dictionary of English v.0.48:

Vent \Vent\, v. i. [Cf. F. venter to blow, vent wind (see
   Ventilate); but prob influenced by E. vent an opening.]
   To snuff; to breathe or puff out; to snort. [Obs.] --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Vent \Vent\ (v[e^]nt), n. [OE. fent, fente, a slit, F. fente a
   slit, cleft, fissure, from fendre to split, L. findere; but
   probably confused with F. vent wind, L. ventus. See
   Fissure, and cf. Vent to snuff.]
   1. A small aperture; a hole or passage for air or any fluid
      to escape; as, the vent of a cask; the vent of a mold; a
      volcanic vent.
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            Look, how thy wounds do bleed at many vents. --Shak.
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            Long 't was doubtful, both so closely pent,
            Which first should issue from the narrow vent.
                                                  --Pope.
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   2. Specifically:
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      (a) (Zool.) The anal opening of certain invertebrates and
          fishes; also, the external cloacal opening of
          reptiles, birds, amphibians, and many fishes.
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      (b) (Gun.) The opening at the breech of a firearm, through
          which fire is communicated to the powder of the
          charge; touchhole.
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      (c) (Steam Boilers) Sectional area of the passage for
          gases divided by the length of the same passage in
          feet.
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   3. Fig.: Opportunity of escape or passage from confinement or
      privacy; outlet.
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   4. Emission; escape; passage to notice or expression;
      publication; utterance.
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            Without the vent of words.            --Milton.
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            Thou didst make tolerable vent of thy travel.
                                                  --Shak.
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   To give vent to, to suffer to escape; to let out; to pour
      forth; as, to give vent to anger.

   To take vent, to escape; to be made public. [R.]

   Vent feather (Zool.), one of the anal, or crissal, feathers
      of a bird.

   Vent field (Gun.), a flat raised surface around a vent.

   Vent piece. (Gun.)
      (a) A bush. See 4th Bush, n., 2.
      (b) A breech block.
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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):

vent
    n 1: a hole for the escape of gas or air [syn: vent,
         venthole, vent-hole, blowhole]
    2: external opening of urinary or genital system of a lower
       vertebrate
    3: a fissure in the earth's crust (or in the surface of some
       other planet) through which molten lava and gases erupt [syn:
       vent, volcano]
    4: a slit in a garment (as in the back seam of a jacket)
    5: activity that frees or expresses creative energy or emotion;
       "she had no other outlet for her feelings"; "he gave vent to
       his anger" [syn: release, outlet, vent]
    v 1: give expression or utterance to; "She vented her anger";
         "The graduates gave vent to cheers" [syn: vent,
         ventilate, give vent]
    2: expose to cool or cold air so as to cool or freshen; "air the
       old winter clothes"; "air out the smoke-filled rooms" [syn:
       vent, ventilate, air out, air]

Moby Thesaurus II by Grady Ward, 1.0:

203 Moby Thesaurus words for "vent":
   air, air duct, air hole, air passage, air shaft, air tube, airway,
   announce, aperture, armhole, articulate, articulation, assert,
   avenue, blow, blow out, blowhole, blurt out, break, break it to,
   break the news, breakout, breathe, breathing hole, broadcast,
   brolly, bullet-hole, bunghole, cast out, channel, chute, clean out,
   clear, clear away, clear off, clear out, clear the decks,
   come out with, communicate, confide, confide to, cringle, deadeye,
   debouch, declare, defecate, deliverance, delivery, deplete,
   discharge, divulgate, divulge, door, drain, drogue chute, duct,
   dump, egress, eject, eliminate, emanation, emergence, emersion,
   emission, emit, empty, empty out, emunctory, enunciate, escape,
   escapism, estuary, evacuate, evasion, evulgate, exhaust, exit,
   expel, express, extrication, extrusion, eye, eyelet, fissure,
   flight, floodgate, flue, flume, freeing, fumarole, funnel, gasket,
   getaway, give, give off, give out, give vent to, grommet, guide,
   harness, hole, inlet, issuance, issue, jailbreak, keyhole,
   knothole, leak, leakage, let get around, let go, let in on,
   let loose, let out, liberation, loop, loophole, loose, louver,
   louverwork, make known, make public, manhole, mousehole, naris,
   nostril, opening, orifice, out, out with, outcome, outfall,
   outgate, outgo, outlet, pack, parachute, parachute jump, passage,
   peephole, pigeonhole, pinhole, pipe, placket, placket hole, pore,
   port, porthole, prisonbreak, proclaim, pronounce, publish,
   punch-hole, purge, put, release, remove, rescue, reveal, riddance,
   sally port, scour out, setting-free, shaft, shroud lines, sky dive,
   slit, slot, sluice, spilehole, spiracle, spout, state, statement,
   surfacing, sweep out, tap, tell, throw off, throw out, touchhole,
   transom, umbrella, unclog, unfoul, unleash, utter, utterance,
   ventage, venthole, ventiduct, ventilate, ventilating shaft,
   ventilator, verbalization, verbalize, vocalization, voice, void,
   vomitory, way out, weir, wind tunnel