1. A connector, usually mounted on a wall, where an electrical plug may be inserted.
2. The place or opening by which anything is let out; a passage out; an exit; a vent.

1. A fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt; SYN. volcano, crater.
2. An opening for the escape of gas or air; SYN. venthole, blowhole.
3. External opening of urinary or genital system of a lower vertebrate.