Gate
point of entry to a space enclosed by building, wall or fence
In the beginning, a gate was a place between two parts of a wall, or a fence which could be opened and closed to let people go through it.
In the Middle Ages, a city gate also allowed people to go into a (walled) city.
Nowadays, people also talk about gates at airports. When going on an aircraft, people need to get together in a certain area of the airport first. They then pass through some kind of doorway to get onto the plane. That is what is called gate.
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A typical gate in a garden or park.
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Ishtar Gate is the oldest city gate in existence.
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Gates to official residences often feature elaborate ironwork.