1 opening, slit, slot, hole, aperture, air-hole, blow-hole, spiracle, orifice, outlet, inlet, funnel, flue, duct, passage; fumarole, fissure, pipe, mofette or moffette:
The tepee has a vent at the peak to let the smoke of the fire escape.
2 give vent to. See 3, below.
3 give vent to, express, verbalize, air, articulate, enunciate, declare, voice, announce, communicate, pronounce, proclaim, reveal, release, let go, let loose, allow to become known, make known, blurt out, make public, broadcast:
Has Margie ever vented her true feelings about your work as a bomb disposal expert? Arnold vents his spleen on any unfortunate who will stand for it.
4 discharge, release, emit, eject, issue, empty, dump, expel, send or pour out or forth, throw out:
It is illegal to vent poisonous fumes into the atmosphere.