What does the suffix ment mean in amuse?

The word "amuse" doesn't have the suffix "-ment." It's the base word itself, meaning "to entertain or divert."

The suffix "-ment" is often used to form nouns from verbs, and it typically denotes the act or process of doing something, or the result of an action.

For example:

* amuse (verb) + ment (suffix) = amusement (noun)

So, amusement refers to the act of amusing or the state of being amused.