Vent has two meanings.

1. With reference to a Volcano or any space:

It is a small opening which allows air, smoke or any liquid to enter or leave a a closed space.

For example:

The main vent of Mauna Loa volcano is very active.

2. In the case of emotions:

To express a negative emotion in a forceful and unfair way.

For example:

Shouting and becoming angry is not a good way to vent your frustration.

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