What does prostigious mean?

"Prostigious" is not a real word. It seems like a misspelling of "prestigious", which means:

* Having a high reputation and standing; esteemed; respected.

* Considered to be of high quality or importance.

For example:

* "Harvard University is a prestigious institution of higher learning."

* "Winning the Nobel Prize is a prestigious honor."

If you meant to use "prestigious," then the meaning is clear. If you used "prostigious" intentionally, you may want to check your spelling! 😊