Which part of the word invasion is the root?

-vas-

-ion

in-

The root of word invasion is '-in'.

Invasion refers to take possession over something. It is also described as an act of capturing or invading. Through an example it's root word '-in' best explains the meaning:

- An invasion of the hotel.

Here, it states that the hotel is captured.

in-

Explanation:

Invasion comes from the latin "invadere". Even in latin, it is a combination of the root in + vadere (which means to go, or to walk). In latin, it would mean "to walk in". This root is used in other words such as the word: inform.