[n] external opening of urinary or genital system of a lower vertebrate
[n] a hole for the escape of gas or air
[n] a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
[v] expose to cool or cold air so as to cool or freshen; "air the old winter clothes"; "air out the smoke-filled rooms"
[v] give expression or utterance to; "She vented her anger"; "The graduates gave vent to cheers"