Gate is a movable barrier, usually on hinges, closing an opening in a fence, wall, or other enclosure.
In modern usage, gate can also mean:
1. The number of people attending an event (box office gate)
2. A scandal or controversy (Watergate, Deflategate)
3. A logic gate in computing
4. Slang for leaving abruptly ("let's gate")
5. In aviation, the area where passengers board