I know it probably means multiple languages, but is that all? The main reason i'm asking is i want to know if i will be able to tell a differnce on a us tv. Like with hi-def televisions or any other types of televisions, I read something hinting to this somewhere else with pal games.

Is this a stupid question or does nobody know the answer?

multi 5 is the number of languages in the game.

if you see a difference between the pal version and the ntsc version, depends on the game.
normally there is no difference.