What does the prefix Mitt mean?

There is no prefix called "Mitt." It is possible you are thinking of the word "mit," which can be used as a prefix or a suffix.

"Mit-" is a German prefix meaning "with" or "together." It is often used in compound words, such as:

* Mittag (German for "noon")

* Mitmensch (German for "fellow human being")

* Mitarbeiter (German for "co-worker")

If you are referring to a different word or concept, please provide more context.