n. activity that frees or expresses creative energy or emotion; "she had no other outlet for her feelings"; "he gave vent to his anger"

n. external opening of urinary or genital system of a lower vertebrate

n. a slit in a garment (as in the back seam of a jacket)

n. a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt