I'd say its more than a little different. The US definition is pretty narrow and immediate. You can't get on a megaphone and tell a crowd to go kill some guy right now.

>Except for nearly all the other countries in Europe, Canada etc.

It's all down to opinion of course but those nations do not have sensible freedom of speech. They pay lip service to the idea but will gladly jail people for saying things the government doesn't like but otherwise harmless or victim less.