It comes from the Latin word "inter", which has the same meaning.
Here are some examples of words with the root "inter":
* Interact: To act upon each other.
* International: Relating to more than one country.
* Interfere: To get in the way of something.
* Intermission: A break between parts of a performance.
* Internet: A global network of computers.
The prefix "inter" is often used to indicate something that is shared, connected, or happening between multiple things.