General English

General Science

  • noun a hole through which air, smoke or gas can leave a building or other structure
  • noun a hole through which gases or lava escape from a volcano


  • noun a hole serving as an inlet or outlet for a fluid, usually a gas such as air

Cars & Driving

  • noun a small opening for the passage of air or gas
  • noun a small triangular window for letting air into the passenger compartment
  • verb to expel through a vent; e.g when bleeding air (through a vent valve or bleed screw) out of a diesel fuel system after running out of fuel.


  • A pipe built into a drainage system to provide air circulation, thus preventing siphonage and back pressure from affecting the function of the trap seals.
  • A stack through which smoke, ashes, vapors, and other airborne impurities are discharged from an enclosed space to the outside atmosphere.
  • Any opening serving as an outlet or inlet for air.


  • An opening which allows the escape of gases, fluids, or other substances which would create unwanted pressure, or whose presence would otherwise be undesired. For example, such a vent utilized to release unwanted gases from certain types of batteries or capacitors.
  • An opening which allows air or another fluid to flow in and/or out of an enclosure or area, so as to provide cooling or warming. Used, for instance, to regulate the temperature surrounding a device.
  • A carefully-dimensioned opening in a loudspeaker enclosure. It is employed for various purposes, but it is mainly used to increase and extend the reproduction of low frequencies. Also called speaker port, port (6), duct (5), or ducted port.

Origin & History of “vent”

English has two words vent. The verb, ‘provide with an outlet’ (14th c.), came via Old French esventer from vulgar Latin *exventāre ‘let out air’. this was a compound verb formed from the Latin prefix ex- ‘out’ and ventum ‘wind’ (source also of English ventilate (15th c.) and distantly related to English wind). Vent ‘slit in the back of a garment’ (15th c.) goes back via Old French fente to Vulgar Latin *findita ‘slit’, a noun use of the feminine past participle of Latin findere ‘split’ (source also of English fission (19th c.) and fissure (14th c.)).