1an opening that allows air, gas, or liquid to pass out of or into a confined space: an air vent the opening of a volcano, through which lava and other materials are emitted: pumice fragments pile up to form a conical heap round the vent
chiefly Scottish a flue of a chimney.
historical the touch hole of a gun. the anus, especially one in a lower animal such as a fish that serves for both excretion and reproduction.
2 [mass noun] the release or expression of a strong emotion, energy, etc.:children give vent to their anger in various ways 1give free expression to (a strong emotion):we vent our spleen on drug barons
2provide with an outlet for air, gas, or liquid:tumble-dryers must be vented to the outside discharge or expel (air, gas, or liquid) through an outlet:the plant was isolated and the gas vented permit air to enter (a beer cask): once the beer has been vented, the cask must be sold within three or four days